Passeriforme-The order is divided into two suborders - Tyranni and Passeri.
Passeri are songbirds. There are over 4,000 birds in this suborder. They are different from other birds because they have a complex set of four muscles in their voice box (syrinx.) These muscles allow songbirds to make complex songs and calls. The birds in this suborder can also learn songs! They learn their songs by listening to other birds in their species.
The Tyranni suborder is made up of over 1,000 species of tropical birds. Most of them are found in South America. The birds in this suborder also can sing songs, but they don't learn them. They are born knowing their songs. There are some 64 families in the Passeriformes order.
Golden Crowned(Regulus satrapa)
