There are 5 (how about Thestrals? And snitch?!) flying creatures in Hogwarts. Places where you may find them are shown on the map below.
Note to number 3: in order to see those birds, you need to climb a bit down. Climb up the wall and look for a descent (north-west side). You'll get an additional hint where to look for them after lighting all the torches on the bridge.
You are not permitted to copy any image, text or info from this page.
This site is not associated with and/or endorsed by the Electronic Arts or EA Games. All logos and images are copyrighted by their respective owners.