From laughing rats to grieving elephants, here is what science really says about the inner lives of animals, and where the evidence is still being debated.
If you have ever shared your home with a cat, a dog, or a parrot, you probably already have an opinion on this question. Perhaps your dog seems to light up when you come home. Perhaps your cat sulks when you change her food. Perhaps you have watched a mother goat call anxiously for a kid that wandered off, and felt sure that she was worried.
But feelings are tricky. We cannot ask an animal how it feels. We cannot give a buffalo a questionnaire or ask a crow to rate its mood from one to ten. So how can anyone know whether animals truly have emotions, or whether we are simply seeing ourselves in their faces?
This guide is written for curious beginners. We will look at what scientists actually mean by “emotion,” what kinds of evidence they use, which animals have been studied, and which questions are still open. You will not need any background in biology. Our goal is to give you a clear, honest picture, one that respects both the evidence and its limits.
First, What Is an Emotion?
In everyday talk, we use words like “emotion” and “feeling” as if they mean the same thing. Researchers often separate them.
An emotion is a built-in reaction of the brain and body to something important. If a snake appears on your path, your heart speeds up, your muscles tense, and your attention narrows. This reaction happens quickly and mostly automatically. It helps you survive.
A feeling is the conscious experience of that reaction, the “what it is like” to be afraid. This is the harder part for science to measure, because feelings are private. You know what fear feels like to you, but you cannot directly see inside another person’s mind, let alone an animal’s.
So when researchers ask whether animals have emotions, they are really asking two questions:
- Do animals have the brain and body systems that produce emotional reactions?
- Do animals also consciously feel those reactions in some way?
The first question has a strong answer. The second is more difficult, but a growing body of evidence suggests that many animals do have some form of felt experience.
A Short History: From Darwin to Today
The idea that animals have emotions is not new. In 1872, Charles Darwin published a book called The Expression of the Emotions in Man and Animals. He argued that humans and other animals share emotional expressions because we share a common evolutionary history. A snarling dog and an angry person, he noted, show surprisingly similar signals.
For much of the twentieth century, however, many scientists took the opposite view. Some believed that animals were best studied as machines that respond to rewards and punishments, and that talking about their feelings was unscientific guesswork. Anyone who described an animal as “happy” or “sad” was accused of “anthropomorphism,” meaning the mistake of projecting human traits onto non-human creatures.
That attitude has changed dramatically. Brain research, behavioural experiments, and decades of careful observation have shifted the conversation. In 2012, a group of neuroscientists signed the Cambridge Declaration on Consciousness, stating that many non-human animals, including all mammals and birds and some other creatures such as octopuses, have the brain structures needed for conscious states. More recently, in 2024, a group of researchers endorsed the New York Declaration on Animal Consciousness, which said there is strong scientific support for conscious experience in mammals and birds, and at least a realistic possibility of it in all vertebrates and many invertebrates. These statements are not final proof, but they show how seriously the scientific community now takes the question.
The Evidence: How Do We Know?
Because animals cannot describe their feelings in words, researchers rely on several lines of evidence. Each has limits, but together they build a stronger case.
1. Shared brain structures and chemicals
Mammals share many of the same emotional circuits in the brain, including regions such as the amygdala, which is involved in fear and threat, and areas linked with reward and bonding. The chemicals that carry messages in these circuits, including dopamine, serotonin, and oxytocin, are also remarkably similar across species.
Birds have a different brain layout from mammals, but research suggests that parts of their brains perform similar jobs. This is one reason scientists now take bird emotions seriously.
The neuroscientist Jaak Panksepp spent his career mapping emotional systems in mammal brains. He proposed that animals share basic emotional systems such as seeking (curiosity and anticipation), fear, rage, care, separation distress or panic, and play. His ideas are still debated, but they have been very influential.
2. Behaviour
Animals show a rich range of behaviour that looks emotional: approaching things they like, avoiding things they fear, comforting companions, playing, and showing distress when separated. Researchers study these behaviours carefully, often comparing them across many individuals so that one surprising story does not mislead them.
3. Body signals
Emotions change the body. Stress hormones rise, heart rate changes, and body temperature can shift. Scientists can measure these signals in many species to see how animals react to different situations, such as being handled, isolated, or reunited with a friend.
4. Facial and vocal expressions
Some animals have recognisable expressions linked with pain or distress. Researchers have developed “grimace scales” for mice, rats, rabbits, and horses, based on changes in the eyes, ears, and face that appear when the animal is in pain. Vocal sounds also carry information, from the whines of puppies to the calls of baby birds.
5. Mood tests
One clever method tests whether an animal’s mood changes how it interprets uncertain situations. People in a good mood tend to expect good things; people in a bad mood expect the worst. Researchers have used similar tests with animals, such as training them that one signal means a reward and another means something unpleasant, and then seeing how they respond to an in-between signal. Animals kept in poor conditions often respond more “pessimistically,” as if expecting bad outcomes. Studies of this kind have been done with rats, sheep, and even honey bees.
Meet the Feeling Animals: Examples from the Research
Rats that laugh and care
It may sound surprising, but young rats make high-pitched chirping sounds, too high for humans to hear, when they play and when they are tickled by a researcher. They often seek out more tickling and approach the hand that did it. Scientists link these sounds to something like joy or playfulness.
Rats also show care for others. In a well-known experiment, rats freed a cagemate trapped in a restrainer, even when they had access to chocolate as an alternative. Many shared the chocolate, too. While interpretations vary, the study is often cited as evidence of empathy-like behaviour.
Dogs: our best-studied companions
Dogs have lived with people for thousands of years, and they are tuned in to us. Studies show that dogs and owners looking into each other’s eyes can both experience a rise in oxytocin, a hormone linked with bonding. Brain-scan research suggests that dogs respond to human voices and emotions in ways similar to how humans do.
But dogs also illustrate the importance of caution. Many owners are sure that their dog looks “guilty” after chewing a shoe. A study by the researcher Alexandra Horowitz found that the “guilty look” appeared mostly when owners scolded their dogs, whether or not the dog had done anything wrong. This suggests the look may reflect the dog’s reaction to our tone and posture, rather than a sense of guilt. The dog feels something, probably worry, but not necessarily what we assume.
Elephants: memory and mourning
Elephants live in close family groups led by older females, and they have long memories. Researchers and wildlife observers across Africa and Asia have documented elephants gently touching the bones of dead relatives, standing quietly beside a body, and even returning to the same place months or years later. Many scientists see this as behaviour consistent with grief, though it is hard to know exactly what the elephant is feeling.
Chimpanzees and consolation
Our closest relatives show behaviour that is easy for us to recognise. Primatologist Frans de Waal described how chimpanzees comfort a distressed neighbour by putting an arm around them after a fight. Jane Goodall recorded a young chimpanzee, Flint, who became withdrawn and seemed deeply affected after the death of his mother. In another well-known experiment, monkeys refused a perfectly good piece of cucumber after seeing a neighbour receive a grape for the same task, suggesting a sense of fairness.
Orcas and grief
In 2018, a female orca known as Tahlequah carried her dead newborn calf for about seventeen days across a vast distance in the Pacific Northwest. People around the world watched with sadness. While we cannot say exactly what she felt, many researchers regard it as a striking example of a mother’s bond.
Crows and parrots
Birds can be surprisingly emotional. Crows recognise individual human faces and can remember people who threatened them, sometimes teaching others to be wary. Parrots form deep pair bonds and can become distressed if they are lonely or bored. Many birds show play, including sliding down snowy roofs, which suggests they have a capacity for fun.
Octopuses, fish, and bees
The question becomes harder as we move further from humans. Octopuses have complex nervous systems and can solve puzzles, play with objects, and show different responses to pain. This evidence led the United Kingdom to recognise cephalopods such as octopuses, as well as crabs and lobsters, as sentient beings in its Animal Welfare (Sentience) Act of 2022.
Fish respond to painful stimuli, avoid places linked with danger, and show stress when kept in poor conditions. Scientists debate how rich their inner lives are, but many now accept that fish are more than simple reflex machines.
Even bees have surprised researchers. In one study, bees that were shaken to mimic a predator attack later behaved more “pessimistically” in tests. In another, bumblebees were observed rolling small wooden balls around with no reward, which some scientists described as a form of play. Whether this means insects have feelings is still hotly debated, and it is an area of active research.
What About Complicated Emotions Like Guilt, Jealousy, and Love?
Here is where the evidence gets more mixed. Basic emotions such as fear, anger, pleasure, and distress at separation are widely accepted in mammals and probably in birds. More complex emotions, such as guilt, shame, jealousy, and romantic love, are harder to test.
Some studies suggest that dogs show jealous-like behaviour when their owner pays attention to a fake dog. Others argue that this may be simpler, such as competing for attention or a reaction to losing something valuable. Similarly, many animals form strong, lasting bonds, which we might call love, but we should be careful about assuming the experience is the same as human love.
Scientists use two helpful terms here. Anthropomorphism means attributing human thoughts and feelings to animals without enough evidence. Anthropodenial, a term from Frans de Waal, means refusing to see any similarities between humans and animals, even when the evidence supports them. Good science tries to avoid both mistakes. The goal is to ask what an animal actually experiences, in its own way, rather than assuming it is either just like us or entirely different.
A Local Angle: Animals in Our Own Lives
In Pakistan, people live closely with animals every day: cats on rooftops, buffaloes and goats in village courtyards, donkeys and horses pulling carts, camels crossing the desert, and birds nesting in our trees. The science of animal emotion matters for all of them.
The story of Kaavan, an elephant who spent many years at Islamabad’s Marghazar Zoo, drew attention across the world. Kaavan was often reported to be lonely and distressed after years of living in poor conditions, and after public campaigns he was moved in 2020 to a sanctuary in Cambodia, where he could be among other elephants. His story reminded many people that wild and social animals have needs that go beyond food and shelter.
For working animals such as donkeys, horses, and bullocks, understanding their emotions can lead to better care. Animals that are overloaded, hit, or left without water do not only suffer physically. They experience stress and fear. Gentle handling, rest, shade, and clean water improve both their welfare and their ability to work.
Even the street dogs and cats that we see every day react to kindness and cruelty. A dog that has been fed by the same person for months will often greet them with a wagging tail, and a cat that has been hurt may stay hidden for days. These small details show that individual animals have personal histories and relationships.
Why Does This Matter?
The question of animal emotions is not only a curiosity. It shapes how we treat the animals around us.
- Animal welfare. If animals can feel fear, pain, boredom, and loneliness, then those feelings matter when we decide how to keep them on farms, in zoos, and as pets. Many welfare laws and guidelines are now based on this idea.
- Better pet care. Understanding your pet’s emotional needs, such as play, company, and safe spaces, can make a real difference to its health and happiness.
- Conservation. Wild animals live in families and social groups. Understanding their stress and bonds can help us design better rescue and protection programs.
- Our own empathy. Learning about animal minds can deepen our sense of connection to the living world, and encourage kindness toward people and animals alike.
How to Read Your Pet’s Emotions
If you share your home with a pet, here are some gentle, practical tips. Remember that these are general guidelines, and every animal is an individual.
- Look at the whole body. For dogs, a loose, wiggly body usually means relaxed and friendly. A stiff body, tucked tail, or pinned-back ears can signal fear or stress.
- Remember that a wagging tail is not always happiness. The speed, height, and stiffness of the wag all matter, so look at the rest of the body, too.
- Watch the eyes and ears of cats. Slow blinking often signals comfort, while flattened ears, a swishing tail, or dilated pupils can mean fear or irritation.
- Notice changes. A sudden change in appetite, sleep, or behaviour can signal pain or distress. If you are concerned, speak to a vet.
- Offer choice and enrichment. Toys, walks, hiding places, and time with you help meet emotional needs.
- Be patient and positive. Reward-based training builds trust, while harsh punishment can create fear.
- Respect their signals. If an animal turns away, licks its lips repeatedly, or moves away, give it space.
Common Myths About Animal Emotions
Myth: Animals just act on instinct and feel nothing. Fact: Instinct plays a big part, but research shows that many animals also have emotional experiences that guide their choices.
Myth: Only humans can feel pain or sadness. Fact: The brain systems for pain and distress are shared across many species, and animals show clear signs of both.
Myth: If animals have emotions, they must be exactly like ours. Fact: Animals likely feel in ways that suit their own bodies, senses, and lives. A dog’s world, shaped by smell, is very different from ours.
Myth: Scientists have settled the question completely. Fact: There is strong agreement for mammals and birds, and growing evidence for other groups, but important questions remain, especially for insects and other very different animals.
A Few Quick Questions
Do all animals have emotions? Scientists are most confident about mammals and birds. Evidence is growing for fish, reptiles, and some invertebrates such as octopuses, but the picture is less clear for simpler animals.
Can animals cry from sadness? Some animals make distress calls or show behaviour that looks like grief, but crying emotional tears, as humans do, has not been clearly shown in other species.
Do animals feel happy? Many animals show play, relaxation, and excitement, which researchers link with positive emotional states. Whether it is the same as human happiness is hard to know, but positive feelings seem very likely.
Can animals sense our emotions? Dogs, horses, and some other animals are good at reading human voices, faces, and body language, and may respond to our mood. This is one reason animals can be so comforting.
Final Thoughts: Looking at Animals with Fresh Eyes
So, do animals have emotions? The most honest answer is that the evidence strongly suggests yes, at least for many of them. Animals share with us the brain systems, chemicals, and behaviours that underpin fear, joy, care, and distress. Yet we should remain humble, because we can never fully step inside another creature’s mind, and the science is still growing.
Perhaps the most useful lesson is this: we do not need perfect proof to treat animals with kindness. When in doubt, it makes sense to give animals the benefit of the doubt, to watch them closely, and to learn how they communicate. Whether it is a loyal dog, a stray cat, a working donkey, or a wild bird in the garden, each one lives its own life, and each deserves our attention and care.
The next time an animal looks into your eyes, take a moment to wonder what it may be feeling. Chances are, there is more going on in there than we ever imagined.
