Altruism (biology)
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In biology, altruism is behaviour by an individual that increases the fitness of another individual while decreasing their own. Altruism in this sense differs from the philosophical concept of altruis
An olive baboon allogrooming a younger one
Cooperative hunting by wolves allows them to tackle much larger and more nutritious prey than any individual wolf could handle. However, such cooperation could, potentially, be exploited by selfish individuals who do not expose themselves to the dangers of the hunt, but nevertheless share in the spoils.
A male peacock with its beautiful but clumsy, aerodynamically unsound tail—a handicap, comparable to a race horse's handicap.
The best horses in a handicap race carry the largest weights, so the size of the handicap is a measure of the animal's quality
Social grooming
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Social grooming is a behavior in which social animals, including humans, clean or maintain one another's bodies or appearances. A related term, allogrooming, indicates social grooming between members
Altruism (biology)
…An olive baboon allogrooming a younger one In biology, altruism is behaviour by an individual that increases the fitness of another individual while decreasing their own. Altruism…
An adult olive baboon grooms a juvenile.
North American beaver family, with the center pair grooming one another
Indian short-nosed fruit bats in a tight-knit cluster
Mutual grooming in ponies