|House Wren with Fecal Sac|
Small songbirds have a unique way to keep the nest clean. Not only would a nest full of baby poop be smelly and a bad place to raise young birds, it might also attract predators.
Nestling birds produce a little round white package of poo, encased in a tough gelatinous membrane. The parent grasps the Fecal Sac by the middle with their beak to dispose of away from the nest. Nestlings usually excrete one sac after each feeding, especially as they get older.
Watch the video: https://youtu.be/NsOzfya3iSA