Tree Swallow vs Mangrove Swallow

In short

Tree Swallows and Mangrove Swallows are both small, glossy swallows, but they can be distinguished by key plumage details. The Tree Swallow has a clean white underbody and lacks the white supraloral streak that is a distinctive feature of the Mangrove Swallow. Both species are similar in size and structure.

Identification tips

1. Look for the white supraloral streak on the Mangrove Swallow, absent in the Tree Swallow. 2. Note the pure white underparts of the Tree Swallow compared to the gray-washed underparts of the Mangrove Swallow. 3. Consider habitat: Mangrove Swallows are more likely in coastal and mangrove areas, while Tree Swallows are found in open areas near water.

Size

Both species are similar in size, typical of small swallows, with no significant differences in structure or proportions.

Plumage

Tree Swallows have iridescent blue-green upperparts and pure white underparts, while Mangrove Swallows have nearly black upperparts with a green-blue gloss that wears to steel-blue, white underparts with a gray wash, and a distinctive white supraloral streak.

Behaviour

Both species exhibit typical swallow behaviors such as aerial foraging and cavity nesting. Tree Swallows are known for their early spring arrival and intense nest defense.

Habitat

Tree Swallows are often found in open areas near water and readily use nest boxes, while Mangrove Swallows are typically associated with mangrove habitats and coastal regions.

Voice

Vocalizations are not distinctly different in the field, and both species produce typical swallow calls.