Molothrus ater - General biology and effects of fire on the brown-headed cowbird. www.fs.fed.us/database/feis/animals/bird/moat
Molothrus ater - Biology of the brown-headed cowbird. animaldiversity.ummz.umich.edu/accounts/molothrus/m._ater.html
Watching Bird Behavior: Cowbirds - About brood-parasitism by cowbirds and its effects on other species. www.petersononline.com/birds/bwd/backyard/0197-watching.shtml
