Intraspecific associations of individual brownheaded parrots (Poicephalus cryptoxanthus)

Abstract

Brown headed parrots (Poicephalus cryptoxanthus) are often seen in large feeding  flocks during summer and in pairs during winter. This has led to the belief that pair  bonds within the species are ephemeral, lasting as long as the breeding season. Observations of group composition and association indices are used to show that this view is mistaken. Brown headed parrots are monogamous, seasonal flock formers. The selection pressures involved in monogamy involve ecological constraints concerning the costs and benefits of mating systems and parental care. Some of these constraints are discussed in the context of the life history strategy of the brown headed parrot.

Key words: group composition, parental care, monogamy, association index.