What does science tell us about depression in animals?

What does science tell us about depression in animals?

While many stakeholders in the commercial wildlife industry believe that animals respond to their environments based on instincts alone, science has demonstrated that animals can experience depression-like behaviours. This information is not new as an early (and highly unethical) study conducted in the late 1960s by Martin Seligman, an American psychologist, showed that dogs subjected to unavoidable electrical shocks gave up trying to escape their environments after repeated exposure. The phenomenon was termed ‘learned helplessness’ and became an important model for understanding depression in humans and animals. 

What does ‘learned helplessness’ mean?

‘Learned helplessness’ occurs when an animal is repeatedly exposed to stressful situations outside of their control. Eventually these animals cease trying to escape their situations. Sadly, even when escape from long-term and repeated exposure to a stressful situation eventually stops, animals experiencing ‘learned helplessness’ may not even attempt to escape. 

How does this relate to depression in animals?

Although Seligman’s study was extremely cruel and unethical, the concept of ‘learned helplessness’ became an important model for understanding the behavioural responses of people (and animals) to depression. It’s a powerful indication that chronic, uncontrollable stressful situations can lead to severe and lasting behavioural and neurochemical changes. 

‘Learned helplessness’ can be seen in passive behaviour, a lack of motivation, and feelings of pessimism that things will never change for the better. In animals, scientists have found that those who display signs of ‘learned helplessness’ even have altered brain chemistry and behaviours similar to people experiencing depression. 

Do animals in captivity experience depression and learned helplessness?

Science shows that wild animals kept in captivity can experience severe environmental deprivation, a lack of control, and long-term exposure to stress, all of which can lead to depression-like behaviours associated with ‘learned helplessness’, such as the following:

Animals showing signs of depression actually mirror what we see in humans experiencing depression, including neurochemical changes in serotonin (implicated in depression) and cortisol (the stress hormone), and neurological changes in brain function and structure. 

What does depression look like in captive animals?

The general public often miss the signs of depression in animals kept in captivity, but the following are strong indicators that an animal is experiencing chronic stress and ‘learned helplessness’:

Animals kept in captivity show these behaviours because captive environments do not provide mental and physical stimulation, they feel isolated from members of their own species, and because they simply cannot escape their stressful environments. 

What does this mean for the welfare of predators kept in captivity?

Captive facilities are by their very nature artificial environments that confine and restrict an animal’s ability to engage in natural behaviours. For predators, like lions and tigers, one of their most inherent behaviours – hunting – is impeded. They are robbed of their ability to roam their territories, hunt prey, and socialise with their own species in ways that are natural to them. Predators kept in captivity often exhibit signs that their environments are harming their well-being and quality of life. By supporting commercial captive facilities, we are failing to genuinely consider wild animals’ quality of life. Even if overt cruelty and neglect is not occuring in a commercial captive facility, captive predators quietly endure stressful and inadequate conditions from birth to death. One or two negative conditions may not feel harmful to the animal’s overall welfare state, but the cumulative impact over its entire life can turn into serious depression and severely affect a captive animal’s quality of life.  

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Is animal welfare compromised throughout a captive lion’s life – from birth to death?

So far in this campaign, we have been looking at animal sentience and how it underpins the way we understand welfare, and how South Africa’s legislation deals with this. 

In our first Animal Sentience blog, we established that many animals, including predators like lions, are sentient beings and therefore experience a range of feelings, including pleasure, warmth, joy, comfort, excitement, cold, pain, anxiety, distress, boredom, hunger, thirst etc. 

By recognising animal sentience, we highlight the importance of the physical and mental welfare and well-being of animals – terms that more or less mean the same thing. The responsibility for the welfare and well-being of any wild animal in captivity falls squarely onto the owner or caretaker of those animals.

It is important to recognise that many wild animals in captivity cannot fulfill their natural needs, as they would in the wild. For example, predators’ prime survival strategy – hunting – is a large part of their natural makeup that they are not able to perform in captivity.

How do we assess animal welfare and well-being?

To assess the state of an animal’s welfare, the internationally recognised Five Domains Model is often used. This model looks at all aspects of an animal’s functioning – their nutrition, environment, physical health, behaviour, and how all four come together to shape an animal’s mental state. 

What does this mean for South Africa’s commercial captive lion industry?

South Africa’s commercial captive lion industry is widely accused, including by the NSPCA, High-Level Panel and Ministerial Task Team, of lacking adherence to appropriate welfare standards. Over the years, the media has covered multiple stories of severe animal cruelty and neglect of predators and other wild animals kept in captivity facilities for mostly commercial purposes. 

So much necessary attention has been given to these cases of severe animal cruelty and neglect, but is animal welfare compromised in a more systemic way across this exploitative industry?

Are captive facilities, including predator parks and self-proclaimed sanctuaries, also compromising animal welfare and well-being in less obvious ways?

For these questions to be answered, we will use the Five Domains Model to delve into animal welfare and well-being across the many stages of lions’ captive lives by unraveling the complex needs of these wild predators in captivity, and the many ways in which owners fail to provide for those needs. 

Lifecycle of a Captive Lion.
What are the welfare implications of removing lion cubs prematurely from their mother?
Lion cubs are routinely removed from their mothers from hours to days after birth, to be bottle-fed and hand-reared by paying volunteers and visitors, who are inexperienced and unqualified animal caretakers. The cubs are fed cow’s milk or milk replacers lacking essential nutrients, vitamins and antibodies. 

Cubs are generally kept in unsuitable, small and barren enclosures with other cubs of similar ages and sometimes even in mixed species-groups (like lions and tigers together), in the absence of adults of their own kind and the love and safety of their mother. 

These adverse physical conditions lead to feelings of pain, sickness, weakness, nausea, discomfort, fear, anxiety, panic, insecurity, confusion, loneliness and even depression, which in turn severely compromises their overall quality of life. 

 

For example, malnutrition and malnourishment as a result of inadequate milk substitutes can cause severe developmental issues such as rickets, deformed spines, weak immunity to diseases, and stomach problems. These formulas are typically higher in sugar content than the mother’s milk would be, which can cause poor eyesight. On top of all this, volunteers and paying visitors don’t adhere to strict hygiene protocols and appropriate feeding which can cause diarrhea and dehydration in the cubs.

Not only is the food inadequate, but bottle feeding by those who are inexperienced and unqualified means that cubs are at risk of gulping air or too much milk, leading to aspiration pneumonia, colic, and pain. Being handled after feeding means cubs can vomit, and even inhale it back in when fed in the incorrect position. 

Mother lions provide essential physical protection even in the form of bodily heat. Newborn lions are not able to thermoregulate and are at risk of being too cold or too hot, especially when exposed to artificial heat lamps. Just like many of us may have seen in very young puppies and kittens, mothers need to stimulate infants to urinate and defecate. Without this done correctly, cubs may experience urinary blockages, constipation and gut impaction, all of which can lead to death. 

Cubs stay with their prides until the age of two years so they can learn everything they need to survive in the wild. In captivity, especially with cubs being removed from their mothers they often cannot even get enough sleep, especially the beneficial kind known as REM sleep (or Rapid Eye Movement that occurs in deep sleep). Frequent handling and a lack of sleep stunts body growth and mental development. 

What are the welfare implications of petting a lion cub?

Inexperienced and unqualified visitors and volunteers pay for the experience of bottle-feeding so-called “orphaned” lion cubs. They are handled by visitors for up to eight hours per day, during a time when they should be playing with their siblings and mother, resting and sleeping. They are often kept in inappropriate, barren and noisy petting enclosures with extreme restricted choices.

These adverse physical conditions lead to feelings of malaise, exhaustion, physical weakness, poor physical development, fear, anxiety, panic, insecurity, confusion, loneliness, anger and even depression. These negative implications on their mental state severely compromises their overall quality of life.

Once cubs are separated from their mother and moved into cub petting enclosures, their barren environments do not provide opportunities for them to thrive. The lack of age-appropriate movement results in poor muscle development and coordination. Cuddling cubs may seem innocent, but at this stage of their lives, their bones are soft and unfused, heightening the risk of bone fractures through being poorly handled or accidentally dropped, especially when human children are allowed to handle cubs. Think about a lioness carrying her cub in the wild – only slightly off the ground and held carefully by the scruffs of their necks. Visitors and volunteers may turn cubs on their backs, pick them up high off the ground, and hold them in ways that are frightening. 

Without the pride’s dynamics, cubs grow up without an understanding of species-appropriate behaviour. Some cubs may become scared and withdrawn while others might become aggressive and dominate more submissive cubs.

What is the most responsible photo you can take?
The one of a cub you didn’t touch. 
The one of a cub lying safely beside its mother, where it belongs in the wild.
What are the welfare implications of speeding breeding lions in captivity?

To meet the demand for a continuous supply of lion cubs entering the commercial wildlife industry means that breeders ensure the lionesses produce as many offspring as possible in order to optimise their income. These females are used as breeding machines in a process that is often referred to as speed breeding. 

Speed breeding essentially means that every time a lioness has a litter, her cubs are pulled away only hours to days after birth. This ensures that the lioness goes back into oestrus far earlier than she would in the wild and can become pregnant again within weeks. Through speed breeding a captive lioness can have up to four to five times more litters in her lifetime compared to a lioness under natural conditions. 

However, the impact of such frequent pregnancies and giving birth has serious consequences for the lioness’ health. Her physical condition will deteriorate and her mental well-being will suffer due to her body going through the stress of pregnancy and the emotional trauma of her cubs being removed from her again and again. 

Added to the physical stress of pregnancy, captive lions are often fed inadequate diets of broiler chickens, supplemented by some beef, horse or donkey meat when available. Chicken is a non-red meat that lacks essential vitamins, minerals  and protein to sustain the mother and her unborn cubs during these repeated pregnancies.

The mother’s health is further impacted by hormonal imbalances from not being able to nurse her cubs and the damage to her reproductive system due to the unnatural high number of pregnancies. The physical effects, pain and discomfort all take an enormous mental toll on lionesses, leading to fear, anxiety and learned helplessness, or depression.

What are the welfare implications of slaughter and “canned” hunting?

As we have seen in the above welfare implications of captive lions, by the time lions enter the stage in their lifecycle of slaughter or “canned” hunting, they have already suffered years of captivity in often substandard conditions impacting on their welfare and well-being.

Slaughter

Since 2019, the international export of lion skeletons is no longer legal, as the Government has not set a CITES annual quota for lion bones. However, captive-bred lions are still killed for their bones, body parts and derivatives and therefore their physical appearance is of no significance. Many of these lions are underfed and suffer from malnutrition for considerable parts of their lives. 

Just before slaughter these lions have been known to be kept in small crates without water and food for more than two days, left waiting to be killed. These lions suffer from thirst, hunger, anxiety and even panic. The slaughter itself happens generally by shooting the lions through the ear without any kind of sedation in order to cause the least damage to the skeleton. This can cause the lions to feel extreme fear and panic, and excruciating pain.

“Canned” or captive hunting

Captive lions are often bred specifically to be hunted under captive or “canned” conditions. Since trophy hunters target aesthetically pleasing and large animals, lions destined for such hunts are bred for characteristically large manes, their size, and even colour, in the case of white lions. Their physical appearance is of utmost importance to hunters, so breeders may provide better care to ensure the animals appear to be in good physical health. 

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However, even if lions going into “canned” hunts are fed and kept in better condition than those bred for bones and parts, their deaths are often cruel and prolonged. In the Limpopo and North West provinces, legislation allows for lions to be released only 24 to 96 hours prior to a hunt taking place. These lions are released into slightly larger enclosures and then pursued from a vehicle, something captive lions have learnt to associate with feeding time. Footage has demonstrated on several occasions that hunters engaging in “canned” hunts are often less skilled and physically able, resulting in wounded animals that need to be shot multiple times to kill them. More disturbingly, lions used for “canned” hunting have no means of escape and other examples of footage have shown callous behaviour in which hunters have pursued lions in trees and burrows. Lions being pursued by hunters in this manner experience not only an excruciating death, but feel immense panic and fear leading up to their death.

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Animal Welfare – #TheyFeelToo

Animal Welfare – Why Should We Care?

In our animal sentience blog, we looked among others at how recognition of animal sentience has created a radical shift, not only in the way we view the moral status of animals, but also how we provide for and ensure their welfare and well-being.

What is Animal Welfare and Well-Being?

According to the World Organisation for Animal Health, animal welfare means “the physical and mental state of an animal in relation to the conditions in which it lives and dies”. It generally refers to issues like humane treatment, standards of care that an animal receives as well as the conditions in which it lives.

Animal well-being takes animal welfare one step further and considers the overall state of an animal’s mind and body, including the physiological, behavioural and emotional aspects.

Animal well-being doesn’t just ensure the absence of animal suffering, it creates the right circumstances for non-human animals to thrive.

In South Africa’s environmental legislation, animal well-being is defined as “the holistic circumstances and conditions of an animal, which are conducive to its physical, physiological and mental health and quality of life, including the ability to cope with its environment”.

How do we Assess an Animal’s Quality of Life?

The recognition of animal sentience and welfare are relatively new and with that our human attitudes towards the treatment of animals have changed over the last 30 years or so.

Whereas for example South Africa’s Animals Protection Act of 1962 still seeks to prevent cruelty to animals, the more modern animal welfare approach aims to provide animals with a quality of life.

The Five Domains Model is a globally accepted model for animal welfare assessment based on sound scientific evidence, considering five key areas: four functional domains (nutrition, physical environment, health, and behavioural interactions) and a fifth domain of the animal’s mental state.

  • Domain 1 – Nutrition focuses on ensuring the animal has access to sufficient, species-appropriate, and balanced food and water to meet their needs.
  • Domain 2 – Environment underlines the need to provide a safe and comfortable environment that allows animals to thrive, including appropriate temperature, shelter, space, and the absence of external stresses.
  • Domain 3 – Health focuses on preventing and treating diseases and injuries, ensuring animals are in good physical condition and free from pain and discomfort.
  • Domain 4 – Behaviour ensures that animals are free to express their natural behaviours, including social interactions, exploration, and other species-typical activities.
  • Domain 5 – Mental State considers the animal’s subjective experiences, including emotions and feelings like thirst, hunger, anxiety, fear, pain, distress and is closely linked to the four functional domains. The mental domain aims to create positive mental states while avoiding the negative ones.
How do the Functional Domains Impact on the Mental State of an Animal?

The four functional domains focus on conditions that create either negative or positive experiences and they all contribute to the animal’s mental state. All of these are ultimately essential for the survival and well-being of the animal. 

Nutrition: When an animal has no water, it will feel thirsty. It has no food or too little, it will feel hungry. When a lion cub is given milk replacers, it may feel weak or unwell. If they have a lack of variety in food or presented in an unimaginative way, the animal will feel bored.

Remember, a captive wild animal can not go in search of water and captive predators are unable to hunt for food.

Environment: When an animal does not have enough space to move around, it will feel stiff. If they have insufficient shelter from the elements, it will feel hot, or cold, or wet, and unwell as a result. If prey and predator species are housed next to each other, the prey animal will feel anxiety and fear.

Health: When an injury goes untreated, the animal will feel pain, maybe even nausea or dizziness. If it is ill, it could feel weak and unwell.

Behaviour: The behavioural domain has three components:

  1. Interaction with the environment.
  2. Interaction with other animals.
  3. Interaction with humans.

For example, if a predator lives in a barren enclosure with no enrichment, it will feel bored and helpless. It could even become depressed. If a social animal like a lion lives in solitary confinement, it will feel lonely and frustrated and may become depressed. If an animal is treated in a cruel or callous manner, it can be fearful or withdrawn, and may attack out of fear.

Ensuring an appropriate level of animal welfare and well-being is not only an ethical matter. For example, preventing the spread of disease creates a better quality of life for animals and reduces public human health risks at the same time. Treating animals with respect also fosters empathy and compassion in people, which in turn contributes to positive mental health and social well-being in our society.

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Animal Sentience – #TheyFeelToo

On a regular basis people with stakes in the wildlife industry argue that animals operate purely based on instincts and survival mechanisms and do not have “emotions or morals as humans do”. They claim that projecting feelings onto wild animals in particular distorts our view of their behaviour, which in turn can hinder effective conservation efforts or appropriate care.

Do non-human animals operate solely on instinct, on fight or flight response and other survival mechanisms or can we attribute more human-like capabilities to animals? 

Do they feel too?

For those questions we turn to science and investigate the phenomenon of animal sentience.

What is Animal Sentience?

When people speak of animal sentience or of sentient beings, they generally refer to the capacity of an animal to have subjective experiences. 

But what does that actually mean?

The word sentience comes from the Latin word sentire which means to feel. When we hone in on this notion of animal sentience and their ability to have subjective experiences, we identify that these can be good or bad feelings, such as pleasure, warmth, joy, comfort, excitement, pain, anxiety, distress, boredom, hunger, and thirst. For social species like lions, this includes the ability to form social bonds.

After a long history of instilling the notion that animals have no cognisance and therefore feel no pain or experience no suffering, the 18th Century English philosopher, Jeremy Bentham, said “the question is not Can they reason? or Can they talk? but Can they suffer?”

This started a long lasting ethics debate amongst philosophers and other intellectuals wrestling with the concept of animals having feelings. A modern day philosopher, Peter Singer, defined sentience in 1979 as “the capacity to suffer or experience enjoyment or happiness”. 

Fast forward 40 years and animal welfare science and bioethics pioneer, Emeritus Professor David J. Mellor, describes sentience as the capacity of animals to consciously perceive by the senses and to consciously feel or experience subjectively. The capacity of animals to experience feelings and emotions includes both positive and negative sensations.

Which Non-Human Animals are Sentient?

There are three criteria generally used in recognising whether or not an animal is sentient:  behavioural, evolutionary, and physiological.

In 2012, the Cambridge Declaration on Consciousness reached a scientific consensus that humans are not the only sentient beings. A body of evidence was developing showing that other non‐human animals, including all mammals and birds, and many other creatures, like octopuses possess neurological substrates complex enough to support conscious experiences. 

Scientists are still not in agreement when it comes to the sentience of fish and invertebrates. There is evidence that some fish for example can experience pain and thus sentience.

There are also ongoing debates around the sentience of insects. Insects and in particular bees have shown surprisingly complex behaviour and cognitive abilities and some scientists argue that they are capable of subjective experiences.

Is Animal Sentience Anthropomorphism?

Unfortunately, non-human animals don’t speak our language and are thus unable to convey their feelings coherently to us. However, that does not automatically make animal sentience anthropomorphism, which is to attribute human thoughts, feelings, motivations, and behaviours to non-human animals. 

Animal sentience is a phenomenon that can be studied and understood through scientific observations and experiments to more comprehensively understand animal behaviour and emotions based on evidence, rather than solely relying on human projections. 

Why is it Important to Recognise Animal Sentience?

The recognition of animal sentience over the last three decades has created a radical shift not only in the way we view the moral status of animals, but also how we provide for and ensure their welfare and well-being. Recognising animal sentience is crucial for animal welfare, as it underscores the importance of considering not only the physical but also the mental well-being of non-human animals.

With this recognition comes a need to move beyond simply ensuring the absence of animal suffering and move towards securing an ability for non-human beings to thrive.

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5 Environmental challenges associated with keeping lions in captivity

Blood Lions Youth For Lions Lion bone trade Tiger bones Predators in captivity Canned hunting Animal welfare Panthera leo Lions in captivity Cub petting Walking with lions Petting lion cubs Predator park Lion farm Lion park Commercial captive lion industry Tiger cub petting Captive predators Ban canned hunting Tigers in captivity Cheetahs in captivity Cute lion cubs Hand-feeding lion cubs Volunteer with lions Hand raise lion cubs Illegal wildlife trade Illegal lion bone trade Born To Live Wild Lion bone quota South Africa #CancelCaptivity

The NSPCA – National Council of SPCAs found the following environmental issues during welfare inspections on commercial captive lion breeding facilities in South Africa:

  • Lack of adequate shelter and shade to accommodate all animals in the camps, which can lead to hypo- or hyperthermia and dehydration (Health Domain);
  • Shelters in disrepair with dangerous protruding objects, rubble and wire around the camps, which can lead to injury (Health);
  • Too many animals kept in small enclosures that can lead to stress (Mental) and fighting related injuries (Health);
  • Cubs, sub-adults and adults kept in separate enclosures, which can lead to stress (Mental) and acting abnormally (Behaviour).

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7 Nutritional concerns associated with keeping lions in captivity

Blood Lions Youth For Lions Lion bone trade Tiger bones Predators in captivity Canned hunting Animal welfare Panthera leo Lions in captivity Cub petting Walking with lions Petting lion cubs Predator park Lion farm Lion park Commercial captive lion industry Tiger cub petting Captive predators Ban canned hunting Tigers in captivity Cheetahs in captivity Cute lion cubs Hand-feeding lion cubs Volunteer with lions Hand raise lion cubs Illegal wildlife trade Illegal lion bone trade Born To Live Wild Lion bone quota South Africa #CancelCaptivity

The welfare conditions identified by the Blood Lions and World Animal Protection research teams were categorised according to a globally accepted animal welfare model – Mellor’s Five Domains Model.

In the Nutrition Domain, 7 conditions were linked to nutritional concerns in keeping lions in captivity globally, such as malnutrition, obesity, dehydration, and vitamin deficiencies.

Fulfilling the optimal dietary requirements for lions in captivity poses a significant management challenge and if not done correctly, can lead to anaemia, dehydration, obesity, emaciation and nutrient deficiencies. These in turn can lead to diseases, such as poor oral health, malformation and spinal cord degeneration, which are part of the Health Domain

The NSPCA – National Council of SPCAs continuously inspects commercial captive lion breeding facilities in South Africa and regularly encounters the following nutrition related issues:

  • Inappropriate diet for adult lions, e.g. rotting meat or chicken instead of a carnivore specialised diet; 
  • Feeding cubs dairy or Esbilac instead of specialised milk formulas, and not adding supplements to ensure the necessary nutrition; 
  • Lack of adjustment in diet for over- and underweight animals.

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15 conditions associated with negative mental experiences of captive lions

Blood Lions Youth For Lions Lion bone trade Tiger bones Predators in captivity Canned hunting Animal welfare Panthera leo Lions in captivity Cub petting Walking with lions Petting lion cubs Predator park Lion farm Lion park Commercial captive lion industry Tiger cub petting Captive predators Ban canned hunting Tigers in captivity Cheetahs in captivity Cute lion cubs Hand-feeding lion cubs Volunteer with lions Hand raise lion cubs Illegal wildlife trade Illegal lion bone trade Born To Live Wild Lion bone quota South Africa #CancelCaptivity

Boredom, frustration, neuroticism, irritation, frustration and anxiety are just some of the 15 negative mental experiences of lions kept in zoos, sanctuaries and wildlife parks that our recently published research identified.

These conditions in the Mental Domain can in turn lead to abnormal behaviours and even physical health issues, as chronic stress and irritation can lead to fighting which can result in injuries and other health conditions.

For example, during welfare inspections on commercial captive lion breeding facilities in South Africa, the NSPCA – National Council of SPCAs found that predator and prey species were sometimes kept in adjacent enclosures without partitioning, which can lead to extreme stress and anxiety.

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