The .wav files listed through FindSounds.com are not terrific, I came up with 4 in a search on "moose". Third one,
http://www.algonquincanada.com/cowmoose2.wav
was the best of the bunch, but suffers from bad recording or compression. Better than nothing, maybe.
Unfortunately FindSounds doesn't search MP3's, so most (but happily not all /ubbthreads/images/graemlins/smile.gif ) of what you'll find through this engine are old, short and overly compressed clips for downloading over a dial-up in the misty days of yore (like 1999).
WR has nothing... I'm still searching...
LionHo