Observations of the Pale-eyed Blackbird in southeastern Peru

We report the first known nest of the Pare-eyed Blackbird (Agelaius xanthop hthalmus) and describe the behavior of breeding and nonbreeding pairs at Co cha Cashu, Manu National Park, Peru. Birds traveled as pairs within limited areas, whether or not they were breeding. During incubation, which is perf ormed only by the female, the male typically remains near the nest and the birds are; in regular vocal contact by means of frequent duets. Its monogam ous social system is similar to that of other marsh-nesting species in its clade.