Many putative examples of coevolution do not stand up to critical analysis. A rigorous
definition of coevolution requires that a trait in one species has evolved in response to a trait …

We reviewed information on nest sanitation (nest cleaning) by passerine birds because the
act of cleaning nests is thought to be associated with egg rejection by hosts of brood …

The Brown-headed Cowbird is known to use the nests of more than 200 other bird species,
and cowbirds in general are believed to play a role in the decline of some migratory …

About one percent of all bird species are brood parasites, ie they lay their eggs in the nest of
another species, which then incubates the eggs and broods the young of the parasite …

The purpose of this book is to explain why red-winged blackbirds are polygynous and to
describe the effects of this mating system on other aspects of the biology of the species …

We conducted a comparative analysis of eight potential correlates of egg rejection in hosts
of the parasitic Brown-headed Cowbird (Molothrus ater) to test the evolutionary equilibrium …

Brood parasites provide a particularly good opportunity for the study of host–parasite
evolution because they directly affect the reproductive success of their hosts. Two parasitic …

We recorded vigilance around sunrise at 140 nests of 10 potential host-species (six"
accepters" and four" rejecters" of cowbird eggs) of the brood parasitic Brown-headed …

Four host species of the parasitic brown-headed cowbird (Molothrus ater) were exposed to
taxidermic mounts of a female cowbird, fox sparrow (Passerella iliaca), and common grackle …

Referential alarm calls occur across taxa to warn of specific predator types. However,
referential calls may also denote other types of dangers. Yellow warblers (Setophaga …