True Facts: Parasitic Birds

There are quite a few bird species that have evolved to outsource nest building, egg brooding, and caring for young to other bird species. The victim, the industrious bird who built the nest, is infused with maternal hormones and/or bad eyesight and will perform its duty -sometimes. Over time, bird species developed techniques for fighting back against parasitic birds, and the battle is on to see whose offspring get a good childhood. There's a lot of lying and disguises and fighting and covert operations involved. No one is better equipped to draw us into the struggle than Ze Frank, who narrates the carnage.