title: Social plasticity in the acorn woodpecker.
abstract: Acorn woodpeckers (Melanerpes formicivorus) in southeastern Arizona exhibited two different types of social organization: one of highly cooperative and resident groups and another of birds that migrated and formed only temporary male-female pairs during reproduction. The occurrence of both patterns in the same population indicates a high degree of social flexibility in this species.
authors.forename: P B
authors.initials: PB
authors.lastname: Stacey
authors.forename: C E
authors.initials: CE
authors.lastname: Bock