Tachornis

Tachornis is a genus of swift in the family Apodidae. It contains the following species:

Pygmy palm swift
Fork-tailed palm swift
Antillean palm swift Tachornis uranoceles

These birds are found in the Neotropics, ranging from the Caribbean to South America. They are characterized by their small size and deeply forked tails.
The name Tachornis derives from the Greek words or, meaning "fast", and, meaning "bird".