The Purple Martin is the largest swallow in North America and one of the largest in the world. Adult males are a solid, glossy, purplish-blue both above and below. Females are colored similarly but less brightly above and have gray napes and foreheads. Below, females have brownish-gray breasts and light gray bellies. Juveniles look much like females, but are streaked underneath. The tails of Purple Martins are slightly forked. In flight, European Starlings can be confused with Purple Martins, but the narrower wings, forked tails, and typical swallow flight of martins distinguish the two.