Some teachers have asked where they could get some of the items that I use on the ENR ID practicum. A very good site, and they have good classroom material as well, is the Acorn Naturalists. I use to get owl pellets from them, too, when my classes were studying ecosystems.
They have the scat and mammal track replicas.
Forestry Area Teacher
South Region Agricultural Education
ABAC 34 - 2802 Moore Highway
Tifton, GA 31793