Currently, listed as “near threatened,” the population of Black-thighed Pufflegs is declining due to loss of habitat. They depend on the edges of humid forests, bushy semi-open pastures, and ravines; they spend little time, if any, in the forest interior. Black-thighed Pufflegs are active, territorial hummingbirds that primarily feed on nectar from low flowers. Both males and females are green above with black tails. The leg puffs of males are black while those on females are a blend of black and white. Females are white below but have large and extensive green spots.