Original: The Black-breasted Puffleg (Eriocnemis nigrivestis) is an average sized (8.5 cm in length) species of hummingbird endemic to Ecuador.
Simplified: The Black-breasted Puffleg (Eriocnemis nigrivestis) is a species of hummingbird endemic to Ecuador. The average length of the black-breasted Puffleg is 8.5 cm.