What branch of biology is dedicated to the study of birds?

I love all birds & love to listen to their morning & evening chitchat. I love it when they share the same tree with our bird types, that have different bed times especially in winter time when you can observe some of them all huddled up together (in pairs, some not) while the others are still partying on haha the world wouldn’t be the same without them that’s for sure.

* Seshati *, depends on the bird. I usually love to listen to them, but not if they have an irritating sound!