Birds ((free)) — Passerines

Passerines make up of all bird species (~6,500+ species out of ~11,000). They are characterized by:

The Secret Life of Perching Birds: Beyond the Song When you look out your window and see a passerines birds

They possess four distinct toes. Three toes point directly forward, while the hallux (the first toe) points completely backward. Passerines make up of all bird species (~6,500+