Purple Martin or Violet-Green Swallow?
Here's how to tell the difference
Purple Martin
Violet-Green Swallow
Purple Martin
Progne subis
General appearance
The purple martin is our largest swallow, measuring approximately 7-8 1/2 inches (18-22 cm). The bird features angular, pointed wings and a distinctive forked or notched tail. Its size is comparable to a robin or sparrow, and it sports various colors including black, blue, grey, purple, and white.
Male vs female
Sexual dimorphism is present in purple martins. Males exhibit a glossy blue-black coloration all over their bodies. Females, on the other hand, are relatively greyer, especially on the bottom part, and they have a white belly. So, if you spot a martin with a white belly, it is most likely a female.
Juvenile
Young purple martins share the same features with the adult females, they are grayer below and have white bellies. As they mature, males will develop their glossy blue-black plumage.
Size
7.7 - 8.1 in/1.6 - 2.0 oz
There's more to learn about Purple Martin
View full detailsViolet-Green Swallow
Tachycineta thalassina
General appearance
The violet-green swallow is about 5 1/2 inches in size and a bit smaller than a Tree Swallow. It shows faster wingbeats with less gliding. It is dark from above, with a color glossed in violet and green when viewed in good light. It has white rump patches that almost meet above the tail, and white circling up on its face. Its wings are long, narrow, pointed, and tapered. The tail is notched and square-tipped.
Male vs female
In terms of differentiation, the females appear to be duller than the males. A significant distinction can be seen on the face, which appears smudged in the case of females.
Juvenile
Juvenile violet-green swallows possess a gray-brown hue from above. The face appears dingy, and it can sometimes be hard to discern such young swallows from their Tree Swallow counterparts.
Size
4.7 - 5.5 in/0.5 oz
There's more to learn about Violet-Green Swallow
View full detailsHow to tell the Purple Martin from the Violet-Green Swallow
Visual differences
Purple Martins are larger swallows at 7-8.5 inches with glossy blue-black males and greyer females with white bellies. They have angular, pointed wings and a forked tail. In contrast, the Violet-Green Swallow is smaller at 5.5 inches, with a vibrant violet-green sheen on its back, white rump patches, and white circling the face. Its wings are long, narrow, pointed, and with a squarer notched tail. Males are brighter than females, whose faces appear smudged.
Key differences and behavior
Purple Martins and Violet-Green Swallows exhibit distinct behavioral differences despite both being social aerial insectivores. Purple Martins are exceptionally social, forming large communal roosts and typically nesting in colonies, especially in human-provided structures in the East. In contrast, Violet-Green Swallows may nest alone or in small colonies of up to 25 pairs and are known for returning to the same site annually. Both species prefer semi-open habitats but differ in their geographical preferences, with Purple Martins favoring areas near water, while Violet-Green Swallows frequent open forests and mountains. Purple Martins have a symbiotic relationship with humans, who provide nesting gourds, whereas Violet-Green Swallows often use natural cavities or man-made birdhouses. Both species share a similar diet of flying insects but do not visit bird feeders. In terms of breeding, both species employ cooperative parenting for feeding chicks.
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