The nest hole is in a dead tree, with the chamber floor up to 30 cm below the entrance.

The nest hole, usually in a live poplar or pine tree.

Instead of sleeping in nest holes, they sleep curled up on branches.

The nest hole is usually made in dead branches.

Their nest holes usually at least 10m above ground.

And coming back from the sea, laden with fish for their young, they can only find safety in their nest holes.

The birds, when they come shooting in through the darkness, seldom land exactly beside their nest hole.

The nest hole may be used as a roost by adults year-round.

To avoid predators, they only return to their nest holes at night.

He may also carry nest material into the nest hole.