In a crowd of animals, how does a parent find its own young? Emperor penguin chicks must recognize and answer their parents' calls in order to be fed. Every flamingo parent can make crop milk, but no parent will feed a chick other than its own. Dolphins recognize relatives by their whistles. These sounds help keep a group together. Dolphin calves develop signature whistles when only about a month old. This helps them stay in contact with their mothers, and bottlenose dolphin mothers nurse their calves for about 18 to 20 months. An orca pod's dialect has been shown to stay the same in a pod for up to six generations.

Not all care is kept for a parent's own young. Related lionesses tend to have cubs at about the same time and nurse each other's cubs, and cub deaths are lowest when they do. Vampire bats share blood meals with relatives and non-relatives alike. In meerkat groups, one dominant female monopolises reproduction. The other group members help raise her pups. Meerkats do not have to be related to belong to the same group. Male sea otters do not provide any care to their offspring, and pups remain with their mother for about 5 to 6 months. Seahorse partners greet each other with a dance every morning to confirm their bond.

Why would an animal help raise young that are not its own? In Yellowstone, older wolf siblings also take part in pup care and feeding. Kin selection is probably the best explanation. Pups there are generally weaned at 5 to 9 weeks old. They are then fed by various pack members through meat regurgitation. Florida scrub-jays are one of the few animal groups where scientists have found a clear benefit to the breeding parents from having helpers. Young jays typically stay in the territory where they were born for at least a year, living as a family group with their parents.

In clownfish, a male and a female and several young may live together in one anemone. The male does most of the egg care. By the next breeding season, mute swan parents drive their young away. A 2016 study found that Asian elephant families are less cohesive than African ones and seem to lack a clear matriarch. In the same study, African savanna elephants showed clear dominance patterns. Female Asian elephants stay in the family unit for their whole lives, while males leave when they mature. The Amboseli elephant project's partners describe its population as the best-known elephant population on Earth, because each elephant is recognized individually, as of November 2026.

Words to know

• dialect: group sound pattern
• siblings: brothers and sisters
• cohesive: sticking together
• generations: family age groups
• dominant: top-ranking
• regurgitation: food brought up