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The bird that built a new floor over an intruder’s egg

An egg that does not belong here
A cowbird can lay its egg in a yellow warbler’s nest, leaving another bird to raise the chick.

An unwanted egg can become the bottom layer of a new nest. For a yellow warbler, starting over can mean burying her own eggs too.

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An egg that does not belong here
A cowbird can lay its egg in a yellow warbler’s nest, leaving another bird to raise the chick.
The warbler builds over the problem
Some females add a new nest floor, burying the cowbird egg beneath it.
A fresh start can bury her own eggs too
Eggs she has already laid can be left below. She lays a new clutch above: a costly reset built into the nest.

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