Arthur posted a link to a cool video from NOVA about cowbirds and nest parasitism in my comments section--check it out! It's a cool video for several reasons--capturing cowbird "mafia behavior," making nest boxes for prothonotary warblers out of juice cartons and a birder named "Bubba." Also, here's a link to a blog entry with Non Birding Bill's footage of a roadrunner nailing a cowbird.