Understanding the basics: http://www.wildernesscollege.com/tracking-animals-2.html
Tracking games: http://nwwoodsman.com/TrackingGame/TrackinGame.html
Wild life tracking: http://www.wildernesscollege.com/identifying-animal-tracks.html
Tracking techniques (scat, skulls, tracks)
http://www.wildwoodtracking.com/techniques/tracksandsign.html
A bunch of tracking quizzes - Real scenes! Tells the level (easy, moderate, difficult)
http://www.trackingquiz.com/quiz/
Track identification quiz (simpler)
http://boyslife.org/hobbies-projects/funstuff/6662/animal-track-identification-quiz/
Another quiz - real pictures
http://nwwoodsman.com/TrackingGame/AnswerElk.html
Links to many articles about how to identify various animals by their tracks
http://www.wildernesscollege.com/identifying-animal-tracks.html
Animal tracks sheet (drawings of tracks)
http://www.beartrackersden.com/trackguide/trackguidecabrera.pdf
Tracks and information about various mammals
http://www.bear-tracker.com/mammals.html