"In Bird Fortress 2, Heavy, Medic, Demoman, Soldier and Sniper have birds, but scouts, engineers, Pyro and Spy want to become new birds.

Scout : Catcher's Companion (https://steamproxy.com/sharedfiles/filedetails/?id=1441079125&searchtext=The+Catcher%27s+Companion)
Engineer : Einprovements (https://steamproxy.com/sharedfiles/filedetails/?id=329804821&searchtext=Eingineer) (https://steamproxy.com/sharedfiles/filedetails/?id=244673796&searchtext=Einprovements)
Pyro : Cockatiel (New)
Spy : Crow (New) (https://steamproxy.com/sharedfiles/filedetails/?id=227398529&searchtext=Aristotle)"