Purple Martin

The Purple Martin (Progne subis) is the largest swallow in North America, celebrated for its spectacular aerial agility, glossy deep-blue plumage, and charismatic social behavior. Throughout eastern North America, these birds have formed a unique, centuries-old mutualism with humans, nesting almost exclusively in specialized colony houses and gourd racks provided by "martin landlords." In the West, they continue to nest in more traditional sites like tree cavities and saguaro cacti. Their presence is a welcome sign of spring, filling the air with musical gurgles and rapid, swooping flights as they sweep the skies for flying insects.

Purple Martins are relatively large and chunky swallows, measuring about 20 cm in length with broad, pointed, triangular wings and a moderately forked tail.

• Adult Males: Draped entirely in a uniform, iridescent dark purplish-blue that can appear black in dim light, but flashes brilliantly in direct sunlight.
• Females & Immatures: Duller and highly contrasting. They feature dark grayish-brown upperparts with some purple sheen on the head and back, a pale grey collar around the neck, and a dingy grey breast transitioning to a white belly.
• Similar Species: Often confused with the Tree Swallow (Tachycineta bicolor), which is much smaller and has a starkly clean white breast and undersides. European Starlings (Sturnus vulgaris) are also dark and chunky, but they have short, square tails and yellow, pointed bills, and do not possess the graceful, soaring flight pattern of martins.

Purple Martins breed throughout much of temperate North America, with the highest densities in the eastern United States and Great Plains.

• East vs. West: In the eastern half of their range, they are entirely dependent on artificial housing situated in open areas like lawns, lakeside parks, and meadows. In the West, they are less dependent on humans, nesting in natural tree cavities in coniferous forests or old woodpecker holes in desert saguaro cacti.
• Migration: They are long-distance neotropical migrants. In late summer, martins gather in massive roosts of tens of thousands before crossing the Gulf of Mexico. They winter primarily in the Amazon basin of South America, especially Brazil, returning north as early as January in the southern United States.

• Feeding: Purple Martins are strict aerial insectivores. They feed on the wing, catching large insects like dragonflies, damselflies, beetles, wasps, moths, and winged ants at high altitudes. Contrary to popular folklore, mosquitoes make up only a tiny fraction of their diet, as martins feed much higher in the air than mosquitoes usually fly.
• Vocalizations: Highly vocal birds. Their songs are a delightful, rich medley of low-pitched, liquid gurgles, croaks, and sweet whistles, often ending in a distinct clicking or rattling sound.
• Nesting: Highly social colonial nesters. In the East, they eagerly accept multi-roomed "apartment" houses and hanging plastic or natural gourds. They construct cup nests of twigs, straw, grass, and mud, lining the bowl with fresh green leaves, which may help regulate humidity or act as a natural insecticide.