The species nests relatively early for a boreal forest bird.

There is evidence to suggest that this species nests may occasionally be arboreal.

This species nests on the ground, laying three or four eggs.

This species nests mainly in the southern spring from September to November.

Most species nest in holes, laying blue or white eggs.

All four species nest in deep horizontal tunnels drilled into banks of earth.

This species nests in colonies, which frequently contain hundreds of pairs.

Over one hundred bird species nest in the area.

The migratory species nest and rear their young through the austral summer until early April.

They haven't suddenly started raiding other species nests in the last 50 years or so have they?