Share this on WhatsApp Brown-headed cowbirds are obligate brood parasites. That means they lay their eggs in the nests of other birds, leaving all the hard work of incubating the eggs and feeding the chicks to somebody else. Luckily, many of those other species have evolved some anti-parasitic defenses. Yellow warblers, for example, produce a … Continue reading Red-winged Blackbirds Understand Yellow Warbler Alarms