A growing body of research across dozens of species shows that many animals do experience forms of empathy, from the simplest emotional contagion to behaviors that look remarkably like concern for another’s welfare. The evidence is no longer confined to our closest primate relatives. Rats free trapped companions and share chocolate with them. Prairie voles console stressed partners. Ravens comfort victims after fights. The science has moved well past asking whether animal empathy exists and is now mapping how it works, what brain circuits drive it, and where the limits lie.
Empathy as a Layered Phenomenon
One reason the question “do animals have empathy?” stayed contentious for so long is that empathy is not a single thing. Researchers studying this across species generally describe it as a set of nested capacities. At the bottom is emotional contagion: simply catching another individual’s emotional state, the way a baby starts crying when it hears another baby cry. Above that sits what is sometimes called sympathetic concern, where an animal not only feels distressed by another’s distress but is motivated to do something about it. At the top is perspective-taking, where an individual models what another is thinking or feeling, even when the situation differs from their own. Perceiving another’s emotional state automatically activates matching feelings in the observer, and with increasing cognitive ability, that state-matching evolved into concern for others and eventually into perspective-taking.1PubMed. Putting the altruism back into altruism: the evolution of empathy
Most animals studied so far clearly show the first layer. A substantial and growing number show the second. The third remains debated outside of great apes and possibly a few other large-brained species. But the key insight is that these layers are not separate inventions. They appear to build on each other, sharing brain circuits and hormonal systems across mammals and even some birds.
Emotional Contagion in the Wild
The simplest, most widespread form of empathy is emotional contagion, and one of its most studied markers is contagious yawning. In humans, yawning when you see someone else yawn correlates with measures of empathy. Researchers found the same pattern in gelada baboons: yawn contagion spread between individuals in ways consistent with an emotional connection, suggesting it could be a building block for more complex empathy.2PubMed Central. Contagious yawning in gelada baboons as a possible expression of empathy In bonobos, the effect was even more socially textured. Yawn contagion was highest among kin and close friends, mirroring the pattern seen in humans. Because geladas and bonobos sit far apart on the primate family tree, researchers concluded that the link between yawn contagion and basic empathy is likely an ancestral trait shared across primates rather than something that evolved separately in different lineages.3PLoS ONE. In Bonobos Yawn Contagion Is Higher among Kin and Friends
Contagious yawning is a small signal, but it reveals something important: animals are not just reacting to the physical environment. They are tuning into the internal states of the individuals around them, and that tuning is biased toward individuals they are emotionally close to. That selective sensitivity is a hallmark of empathy in humans as well.
Rats That Free Trapped Companions
Some of the most striking evidence for animal empathy comes from rodents, which are far removed from humans on the evolutionary tree. In a now-classic experiment, a free rat was placed in an arena with a cagemate trapped inside a small restrainer. After several sessions, the free rat learned to open the restrainer deliberately and release the trapped companion. Rats did not bother opening empty restrainers or ones containing a toy. Even when the setup prevented physical contact after release, rats still freed their cagemates. And when researchers placed chocolate in a second restrainer alongside the trapped rat, the free rat typically opened both and shared the chocolate.4PubMed Central. Empathy and pro-social behavior in rats
That last detail matters. The rats were not just responding to their own distress at hearing a companion’s calls. They were weighing a high-value reward against helping and choosing to do both. Follow-up work investigated whether this helping behavior depends on familiarity. Using a similar paradigm, researchers found that most rats were motivated to release a trapped cagemate, and about half also freed unfamiliar rats from a different social group, with no statistically significant difference between the two conditions.5iScience. Neural circuits and oxytocin receptor-expressing cells supporting helping behavior in rats This suggests that at least under some laboratory conditions, helping behavior in rats is not strictly limited to familiar individuals.
Mice show a related phenomenon through a different lens. When mice watched other mice receiving foot shocks, the observers developed fear responses themselves. Those fear responses were stronger when the demonstrator was a sibling or a mating partner than when it was a stranger.6PubMed Central. Observational fear learning involves affective pain system and Cav1.2 Ca2+ channels in ACC The observers were not in any danger themselves. They were absorbing the emotional experience of another individual, with the strength of that absorption tracking social closeness.
Shared Brain Circuits
If animal empathy were just a collection of superficially similar behaviors, each species might use entirely different neural hardware to produce them. That is not what the research shows. Across mammals, the brain regions most consistently linked to empathy-related responses are the anterior cingulate cortex, the insula, and the amygdala. Studies in both humans and other animals have identified portions of the insula and anterior cingulate cortex as critically involved, and animal models have pointed to subdivisions within the anterior cingulate that are crucial for social behavior.7PubMed Central. The anatomy of empathy: Vicarious experience and disorders of social cognition
Work in rodents reinforces this. When a mouse or rat witnesses another’s distress, the emotional contagion it experiences depends on the cingulate cortex, amygdala, and insula, the same regions that sit at the core of human empathy.8Affective Science. Vicarious Emotions of Fear and Pain in Rodents The vicarious emotion that arises mirrors some level of detail of what the other animal is feeling, including whether a threat is nearby or distant. This is not a vague stress response. It is a structured emotional echo running through conserved neural pathways.
Oxytocin and the Chemistry of Caring
The hormone oxytocin, often loosely called the “bonding hormone,” plays a specific and measurable role in empathy-driven behavior. Prairie voles, small rodents known for their monogamous pair bonds, will approach a stressed partner and groom them, a behavior researchers call consolation. When scientists looked at what was happening in the voles’ brains during consolation, they found increased activity in the anterior cingulate cortex. When they blocked oxytocin receptors in that region, the consolation behavior disappeared.9PubMed Central. Oxytocin-dependent consolation behavior in rodents The neural mechanism looked remarkably similar to what drives empathic responses in humans.
Further experiments with prairie voles lacking functional oxytocin receptors confirmed the pattern. When placed in a situation where they could open a door to reach a distressed companion, voles without oxytocin receptors were significantly slower to help and showed less interest in the distressed individual compared to normal voles.10iScience. Helping behavior and oxytocin receptor in prairie voles Some of these voles never opened the door at all, even after multiple sessions. Oxytocin does not create empathy from scratch, but it appears to be a critical amplifier that turns emotional awareness of another’s state into motivated helping behavior.
Consolation Among Apes
Consolation, where a bystander approaches a distressed individual to offer calming contact, has been documented most extensively in great apes. After conflicts within a group, bystanders will approach the victim and engage in embracing, touching, and grooming. In bonobos, researchers using standardized observation methods across 36 individuals of all ages found that consolation and reconciliation occurred across age and sex classes, using a suite of affiliative and socio-sexual behaviors.11PubMed Central. Bonobos respond to distress in others: consolation across the age spectrum The fact that juveniles consoled others suggests this is not purely a learned adult strategy but emerges early in development.
Consolation in apes is not indiscriminate. It tracks relationship quality. Individuals are more likely to console those they have strong social bonds with, and the behavior appears to reduce stress-related behaviors in the recipient. This pattern is consistent with the idea that consolation is motivated by genuine sensitivity to another’s emotional state rather than a calculated social maneuver, though researchers continue to debate exactly where to draw that line.
Ravens and the Surprise of Avian Empathy
Perhaps the most surprising empathy-like behaviors have been found in birds, particularly corvids. Ravens, which are not closely related to mammals at all, show clear consolation-like behavior after conflicts within their groups. In a study of captive ravens, researchers found strong evidence that bystanders affiliated with victims after fights, particularly after intense conflicts, and that the bystanders involved were those who shared a valuable relationship with the victim.12PubMed Central. Do ravens show consolation? Responses to distressed others These findings suggest that ravens are sensitive to the emotions of others and direct their comforting behavior based on relationship quality, just as apes do.
Ravens also reciprocate social support, but the way they do it is telling. They return the favor in the long run among individuals they have strong bonds with, rather than keeping a short-term tally of who helped whom. Researchers have suggested that emotional mediation, rather than strict scorekeeping, explains how ravens decide when to step in and whom to support during conflicts.13Animal Behaviour. Reciprocity of agonistic support in ravens In other words, ravens seem to help because they care about certain individuals, not because they are tracking debts.
The convergence between raven and ape consolation behavior is striking because these two lineages have been evolving independently for hundreds of millions of years. If both arrived at similar empathy-driven social behaviors, it suggests that the capacity for empathy has strong adaptive value wherever complex social living evolves.
Elephants and Whales
Large-brained, long-lived social mammals offer some of the most vivid anecdotal and increasingly systematic evidence for empathy. In a study of captive Asian elephants in Thailand, researchers found that elephants affiliated significantly more with other individuals through directed physical contact and vocal communication following a distress event than during control periods.14PubMed Central. Asian elephants (Elephas maximus) reassure others in distress Elephants would approach a distressed companion, touch them with their trunks, and produce specific vocalizations. The behavior was directed and appeared aimed at calming the upset individual. Elephants also pass mirror self-recognition tests, a capacity thought to correlate with higher forms of empathy and altruistic behavior.15PubMed Central. Self-recognition in an Asian elephant
Cetaceans present a different challenge for researchers because their behavior is hard to observe systematically in the open ocean. But evidence is accumulating. In a review of humpback whale entanglement events, researchers compiled 62 accounts of “companion whales,” individuals that stayed close to an entangled whale during rescue operations, from a dataset of 414 entanglement reports.16PubMed Central. Tending the sick: Observations of epimeletic behavior in humpback whales towards conspecifics during entanglement events These companions remained in association with the distressed whale, sometimes for extended periods. While the motivations of a whale are hard to parse, the consistency of this behavior across dozens of independent observations suggests it is not coincidental.
Dogs Reading Human Emotions
Dogs occupy a unique position in empathy research because they respond not just to the emotions of their own species but to human emotions as well. When researchers played recordings of human emotional vocalizations to dogs, the animals showed distinct physiological and behavioral responses to different emotional categories. For sounds of fear and sadness, dogs consistently turned their heads with the left ear leading, a pattern associated with processing negative emotions in the brain’s right hemisphere.17Scientific Reports. Lateralized behavior and cardiac activity of dogs in response to human emotional vocalizations
Even more telling, when dogs heard recordings of a human infant crying, they showed a physiological stress response similar to the one humans show when hearing the same sound. Dogs also displayed a unique behavioral combination of submissiveness and alertness in response to the crying, providing what researchers described as the first clear evidence of a primitive form of cross-species empathy.18PubMed. Emotional contagion: dogs and humans show a similar physiological response to human infant crying This cross-species emotional contagion likely reflects both the ancestral wolf’s social sensitivity and thousands of years of domestication selecting for dogs that are attuned to human emotional cues.
Where Skepticism Persists
Despite the accumulating evidence, researchers urge caution about over-interpreting animal behavior through a human lens. Proving that an animal feels concern for another, rather than simply experiencing distress triggered by another’s distress signals, is genuinely difficult. A rat that opens a restrainer to free a companion could be motivated by empathy, but it could also be motivated by the desire to end an aversive noise, or by the expectation of social reward. Disentangling these explanations requires increasingly clever experimental designs. As one review noted, despite the adaptive advantages of emotional contagion and its presumed simplicity, studying and directly demonstrating this phenomenon presents more complexities than previously thought.19PubMed Central. Emotional contagion in nonhuman animals: A review
There is also the question of how far perspective-taking extends outside humans. Some researchers argue that great apes and possibly corvids share foundational social cognitive mechanisms with humans, including elements of what has been called theory of mind, the ability to understand what another individual knows, wants, or believes.20Wiley Interdisciplinary Reviews: Cognitive Science. Theory of mind in animals: Current and future directions But whether any nonhuman animal truly understands that another has a different perspective from its own, rather than just predicting behavior based on learned cues, remains one of the most debated questions in comparative psychology. The evidence is suggestive for apes and some corvids but far from settled.
Why Empathy Evolved
From an evolutionary standpoint, empathy makes sense as an engine for directed helping. If you feel distressed when your offspring, your kin, or your long-term social partner is in trouble, you are more likely to intervene, and that intervention pays off genetically. Empathy-induced altruism derives its strength from giving the self an emotional stake in the other’s welfare, and the dynamics of empathy align with predictions from both kin selection and reciprocal altruism.1PubMed. Putting the altruism back into altruism: the evolution of empathy You help not because you have calculated the costs and benefits, but because you feel compelled to.
This framework also explains why empathy is strongest toward close social partners across so many species. A reflexive appreciation of others’ intentions, emotions, and perspectives may have evolved because natural selection favored individuals motivated to empathize with others and attend to their social interactions. These skills are adaptive because they are essential to forming strong social bonds, which in turn enhance reproductive success.21PubMed Central. Affiliation, empathy, and the origins of theory of mind Empathy is not an altruistic luxury. It is a social tool that pays for itself by keeping cooperative relationships intact.
How Early Life Shapes Empathic Capacity
One of the more recent and intriguing findings is that empathy in animals is not fixed at birth. It can be shaped by early experience. In rats, the quality of maternal care during infancy predicted how much empathy-like behavior the animal showed as an adult. Rats that received high levels of maternal care were significantly more likely to help a distressed companion later in life than rats that received low levels of care. The difference was linked to expression of a gene involved in brain development and plasticity across several brain regions associated with empathy.22Brain Research. Quality of early-life maternal care predicts empathy-like behavior in adult male rats: Linking empathy to BDNF gene expression in associated brain regions
This finding echoes what we know about human empathy development, where secure early attachment and responsive caregiving are associated with greater empathic ability later in life. The parallel suggests that the developmental scaffolding of empathy is conserved across mammals: the basic biological capacity exists, but it needs the right early social environment to fully develop. An animal raised in social deprivation may have blunted empathic responses, just as a child raised without adequate emotional connection can struggle with empathy as an adult. The implication for animal welfare is straightforward. Housing conditions, maternal separation, and early social experience in captive and laboratory animals are not just welfare concerns in their own right. They shape whether an animal develops the full range of social capacities its biology supports.