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.