A Swallow community affair

It looked like it's the time of the year again when the Pacific Swallows breed, but before that, nest building.  Nest building for these birds is a collective effort.  Collection of materials include dry stuff as well as wet mud.

These two, sub-adults in moulting plumage, were going for the wet mud.

The birds were flying in and off with the materials so I guessed the nest must be close by.

Looked like not any dry stuff could be used!

And then it's rest time, perhaps preening to rid off water and whatever stuck on after freely rummaging in the wet ground.