Tree Swallow vs Purple Martin

Tree Swallows and Purple Martins can be distinguished by size and plumage. Tree Swallows are smaller with iridescent blue-green upperparts, while Purple Martins are larger and have a more uniform dark purple-blue appearance. Both species are cavity nesters but differ in habitat preferences and vocalizations.

Size: Purple Martins are larger. Plumage: Look for iridescent blue-green in Tree Swallows vs. uniform dark purple-blue in Purple Martins. Habitat: Tree Swallows are more adaptable; Purple Martins prefer communal nesting near humans. Vocalization: Listen for cheerful twitters in Tree Swallows and rich gurgles in Purple Martins.

Purple Martins are noticeably larger than Tree Swallows.

Tree Swallows have iridescent blue-green upperparts and white underparts. Purple Martins, especially males, are uniformly dark purple-blue, while females and immatures are duller with some lighter underparts.

Both species are aerial insectivores and cavity nesters. Tree Swallows often use artificial nest boxes and are known for their early spring arrival and intense nest defense. Purple Martins also use artificial structures but are more vulnerable to cold weather.

Tree Swallows are more adaptable and can be found in a variety of open habitats, often near water. Purple Martins prefer open areas near human habitation where they can find large, communal nesting structures.

Tree Swallows have a series of cheerful, liquid twitters. Purple Martins produce a variety of low, rich, gurgling notes and chirps.