[NHCOLL-L:386] animal sounds

[Bill Alther]

Although this is not a collections issue, I am wonding if anyone has an idea where sound recordings of the following animals might be obtained, copywrite-free or at least with permission:

Elephant
Snowy Owl
Crickets
Rattlesnake

Our education department needs a few seconds of each sound for a program being developed at our museum (Denver Museum of Natural History).  Any suggestions are welcome.  Thanks.