Martin pairs often nest alone, although where suitable sites are available small loose colonies may form.

They are solitary except during the breeding season when they form loose colonies.

They are usually scattered on the substrate, but also often grouped in loose, large colonies.

The breeding territory and several pairs will often nest close together in a loose colony.

During the breeding season, it lives in loose colonies.

Nests are usually single but sometimes in loose colonies that may contain over 10 pairs.

The birds sometimes breed in loose colonies of up to 20 pairs.

Several nests may be built in the vicinity by pairs that form a loose colony.

They often form loose colonies on the windward sides of the islands.

The species breeds in loose colonies or small groups, and sometimes is a solitary breeder.