Costs of coloniality and the effect of colony size on reproductive success in purple martins

Barn swallow (Hirundo rustica) from Birds of North America

Barn swallow (Hirundo rustica) from Birds of North America

The evolution of coloniality: the importance of colony size

Seventeen summers of swallows

Natural selection on tail and bill morphology in barn swallows Hirundo rustica during severe weather

Fitness components associated with alternative reproductive tactics in cliff swallows

Swallow Summer

Intense natural selection on body size and wing and tail asymmetry in cliff swallows during severe weather

Coloniality in the Cliff Swallow: The Effect of Group Size on Social Behavior