Hippogriff.
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Buckbeak is computer animated.
Buckbeak was provoked by Draco and later attacked him.
In POA, Harry and Hermione used her time turner to go back and save Buckbeak from the execution. Sirius later flies off with Buckbeak, both escaping the clutches of the ministry. In Order of the Phoenix, it is revealed that Buckbeak was living with Sirius.
Depending on the shot, Buckbeak is either computer graphics or an animatronic.
I think you are talking about the raven, which symbolizes death. It can be seen when buckbeak is killed.