Most male birds sing, but in the tropics most females engage in duets.
Unlike humans, some birds have the ability to two notes at once.
Birds sign to defend and stake out their home territory.
Birds awaken before dawn and begin singing their hearts out.
Songbirds of the same species may have different dialects depending on their geographic area.
Birds, just like humans, have to listen and learn their language.
Male birds sing to attract mates.