The greater ani (Crotophaga major), a Neotropical cuckoo, exhibits an unusual breeding
system in which several socially monogamous pairs lay eggs in a single nest and contribute …

In many cooperatively breeding societies, only a few socially dominant individuals in a
group breed, reproductive skew is high, and reproductive conflict is common. Surprisingly …

Members of social groups may negotiate among each other about the exchange of goods
and services. If this involves asymmetries between interacting partners, for instance in …

Species breeding in urban environments are highly prone to a wide variety of non-natural,
human activities, which range from short-term disturbances to the degradation or loss of …

Although at variance with Darwinian theory, adoption of unrelated offspring has been
reported in a variety of ground-nesting colonial seabirds. Pierotti & Murphy (1987, Anim …

Identifying correlations among behaviors is important for understanding how selection
shapes the phenotype. Correlated behaviors can indicate constraints on the evolution of …

The foraging benefits of coloniality, whereby colony members exchange information about
food location, have been suggested as a primary factor influencing the evolution of …

ABSTRACT A pattern of significant morphological over-dispersion among successfully
introduced bird species has previously been documented on several islands. In a recent …

Sympatric species must sufficiently differentiate aspects of their ecological niche to alleviate
complete interspecific competition and stably coexist within the same area. Seabirds provide …

The amount of food ingested by chicks has often been suggested as being the main
proximate factor controlling broodmate aggression in facultatively siblicidal species …