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.
Procellaria t1_itk46cz wrote
Reply to comment by Em_Adespoton in Do birds reuse existing nests that have been abandoned previously? by scottbody
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.