Northern Scrub-Flycatcher (Sublegatus arenarum)

The Northern Scrub-Flycatcher is a resident species, similar to the members of the Myiarchus family, which is notably difficult to identify at a species level. Like its name might imply, this small bird prefers scrub habitat, which is composed of small trees and tall grass. We found an individual at Tárcoles River, in the swampy area that surrounds the river. It was full of mosquitoes, which is probably the reason species like this one like the area. It was interesting to see this individual raising its crest, most probably a display to let us know we were in his/her territory.

Mangrove Swallow (Tachycineta albilinea)

Mangrove swallows are interesting in that they are not only found inside the mangrove forest, but in the whole river ecosystem. We did see a few of these birds inside the mangrove. They were flying by the boat very rapidly like most other swallows, which made in-flight pictures very difficult. Still pictures were better, as the birds perched in huge numbers on dead trees. They are distinguished from other swallows by their white underparts (up to the throat) and metallic green upperparts, only similar to the Blue-and-white Swallow, however the latter species is found throughout the country and not just on the coast; also it has blue upperparts instead of green.