I tried to search something about bird-like animal flight simulation but it looks like everything is spammed with flappy bird 2D questions.
I want to have in my 3D game bird-like animals with realistic flight, for example we have a scene where player attacked by predator birds and he must attack them with gun. When I say bird-like, I mean that animal has wings.
As I understand I need to apply force to bird object to compensate gravity force, but if I do this strictly, it looks very unnatural. So could someone provide good description or maybe links to good articles about such simulation for 3D game?