Two lines of reasoning predict that highly social species will have mechanisms to influence
behavior toward individuals depending on their degree of relatedness. First, inclusive fitness …

Animal societies of varying complexity have been the favoured testing ground for inclusive
fitness theory, and there is now abundant evidence that kin selection has played a critical …

Seabirds comprise about 328 species in four orders, the Spenisciformes (penguins; 17
species in one family), Procellariiformes (albatrosses, shearwaters, petrels, diving petrels …

Some species (eg migratory species with high movement ability) are unlikely to experience
any physical cost when dispersing, at least at the landscape scale. In these species …

Avian literature on sibling recognition is rare compared to that developed by mammalian
researchers. We compare avian and mammalian research on sibling recognition to identify …

We investigated the settling pattern of barnacle geese Branta leucopsis that returned to
breed in their natal colony. Females nested close to their parents and sisters, but settling of …

Adoption of unrelated offspring by successful breeders is one form of brood mixing and
alloparental care that is widespread among geese and other waterfowl. Biparental care and …

Often in colonial seabirds, all colony members are believed to defend against nest predators
and experience equal nest predation risk. However, the variation of defense behavior …

We observed a case of infant adoption in an unprovisioned group of wild black-fronted titi
monkeys (Callicebus nigrifrons). During our long-term field study we noticed that an infant …

Animals and plants routinely produce more offspring than they can afford to rear. Mothers
can favour certain young by conferring on them competitive advantages such as a leading …