Cliff Swallows

Cliff Swallows are Abundant in West Washington from Late March- Mid July but may still go into Early September the earliest Swallows to start departing back to warmer climates spending most of there time in the air eating flying insects like, Houseflies, Sand-flies, Snake-flies, Midges, Carpenter Ants, Male Yellowjackets, Honey Bees, Spiders in air, Damselflies, Lady Bugs, Grasshoppers, Leaf-hoppers, Crane Flies, Lacewings. Milkweed Borders, Mosquitoes, may ingest mud.
Habitat 
Is Mainly near Mud sites with adjacent Buildings, bridges, or large culverts but are seen forging through many spots, including rivers, lakes, ponds, marshes, estuaries, gravel pits, prairies, bogs, towns, suburbs, and occasionally cities. There appears to be many suitable areas for them but still not seen there.

Behavior

Cliff Swallows forage high in the air, soaring in circles, but they are less agile in flight than other Washington swallows. This is one of the most social land-birds of North America, generally nesting in large colonies (of up to 3,500 nests!) During nesting season Cliff Swallows gather at mud puddles to collect mud that they carry to their nests in their bills. While at these puddles, both males and females flutter their wings up high, which appears to prevent attempts at forced copulation. Extra-pair copulations are common, as is brood parasitism. Females will lay eggs in other females' nests and will also carry eggs in their beaks from their own nests to the nests of others.