They are a brilliant blue with contrasting red breastfeathers and face. There is a crest of blue feathers extending from their head, a vertical stripe of blue extending onto their red-colored chest, and a white coloration on the underside of their belly and wingfeathers. They also have sharply shaped wings and red-tipped tailfeathers that are specifically designed for speed. Swellow also possess red feet that are armed with talons. Its feet are strong enough to carry heavy Pokémon.