I have listed some samples of wolf vocalizations and some other animals that you may hear or encounter on a wolf howl survey. 


Rare Mammal Observations,
http://dnr.wi.gov/topic/wildlifehabitat/mammalobsform.asp

Animal vocalizations:
http://macaulaylibrary.org/

Wolf vocalizations:
http://www.pbs.org/wgbh/nova/wolves/howl.html
http://www.boomerwolf.com/wsounds.htm
http://www.youtube.com/watch?v=937A1ELVyUs

Coyote vocalization
http://www.youtube.com/watch?v=M7CbVIXxYbA
http://www.youtube.com/watch?v=7wJc_LpV8E4
http://library.thinkquest.org/05aug/00260/facts/call.html

wolf, coyote,& dog
http://coyotelady.blogspot.com/2008/01/vocalization-comparisons.html

Dog Howls,
http://www.youtube.com/watch?v=casAdDDqHxE&feature=related
http://www.youtube.com/watch?v=3KWn3q_DKQ0&feature=related
http://www.youtube.com/watch?v=M59GEjRoGN4&feature=related

Gray Fox,
http://home.comcast.net/~richpeet/Unk.mp3
http://macaulaylibrary.org/search?location_id=&location_type_id=&location=&recordist=&recordist_id=&catalogs=&behavior=&behavior_id=&tab=audio-list&taxon_id=11036139&taxon_rank_id=67&taxon=common+gray+fox

Red Fox vocalizations,
http://www.angelfire.com/ar2/thefoxden/sounds.html
http://macaulaylibrary.org/search?location_id=&location_type_id=&location=&recordist=&recordist_id=&catalogs=&behavior=&behavior_id=&tab=audio-list&taxon_id=11036954&taxon_rank_id=67&taxon=red+fox

Bobcat vocalizations,
http://www.youtube.com/watch?v=9lh5SY_XaDM
http://pictures-of-cats.org/Bobcat-Sounds.html

Raccoon vocalizations
http://pelotes.jea.com/raccoon.htm
http://www.degus.com/racvidsound.html

Owl Vocalizations
http://home.centurytel.net/bobowlcalls/Barred_Owl_calls.htm

Cougar vocalizations
http://www.acoustics.org/press/143rd/Potter.html
http://www.bear-tracker.com/cougar.html

(This information was supplied by Nancy Christel, NBWA Property Manager)