At a time in history when the males of the family had to hunt for food for the family, young boys were taught to track their prey by the evidence animals leave behind. Such skills have been lost to most of us since we buy our food at the grocery store. Recreational hunters and biologists, however, still find such skills useful.
In the Woods: Who's Been Here? by Lindsay Barrett George discusses nests, food remnants, feathers, egg cases, and other evidence of recent animal visitation.
In the Snow: Who's Been Here? by Lindsay Barrett George discusses tracks, feathers, owl pellets, and other evidence of recent animal activity.
Who Pooped in the Park by Gary D. Robson examines scat and tracks.
It is possible to buy rubber replicas of various types of feet and then using an ink pad make tracks on paper for study. It is also possible to buy molds of various types of tracks which can then be filled to create replicas.
Owl pellets and information about their dissection can also be purchased.
Animal Lives: Barn Owl by Sally Tagholm
Animal Predators: Owls by Sandra Markle
The Book of North American Owls by Helen Roney Sattler
Owls in the Family by Farley Mowat - Adding two owls to the family causes all sorts of problems.
There is an Owl in the Shower by Jean Craighead George
Hoot by Carl Hiaasen