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Em_Adespoton t1_itjqfwz wrote

Depends on the birds. Some will reuse old nests, fixing them up each year, while others will push the old nest and start again from scratch, while still others will wait until another bird has made a nest and then come in and eat their eggs and take over the nest.

And then cowbirds and cuckoos will just lay their eggs in another bird’s nest and fly away.

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Procellaria t1_itk46cz wrote

Adding to this... some species (eg Kestrels) will use stick nests built by other birds (eg Ravens) after they've finished nesting themselves. Tree hollow nesters (eg Cockatoos) will use a hollow after another species (eg Owl) has finished nesting in the hollow.

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