Does the kookaburra take over other birds nests?

No. Kookaburras are not nest raiders. They make their own nests in tree hollows, or in hollows within termite nests up in trees. They will use their strong beak to dig out the hollows to enlarge the space. They lay their own eggs in their own nests, and do not raid the nests of other bird species.

However, kookaburras have been known to eat the chicks of other birds on occasion. This is not their normal diet, as they prefer to swoop down and collect small reptiles from the ground.