Species parasitized by Brown-headed and Bronzed cowbirds, listed by host flange color. Fledgling tallies do not include those detected as eggs. Only nests available during cowbird laying (23 April–27 July, 1999-2002) are presented. Northern Mockingbird (Mimus polyglottos) nests (n = 226) were not parasitized; Northern Mockingbird young have yellow flanges.