Yellow Rumped Warbler - Audubon Plush Bird (Authentic Bird Sound) Wild Republic has joined hands with Audubon to create its new line of birds. Each birds lifelike design and detailing are the result of input by Audubon. Additionally, the sounds in each toy are authentic birdsongs provided by the Cornell Lab of Ornithology, and represent hours, months, even years of in-the-field work conducted by expert recordists. Yellow-rumped Warblers are common throughout much of Canada and North America at some point during the year. During winter months they migrate to the southern US and Central America. During fall and winter, they feed on berries, nectar, and seeds. In spring and summer, insects make up most of the diet. Females build nests from plant materials, while males defend the nest and surrounding territory.