In 2004 Park Biologist Myra Barnes wrote and published a short history of the above topic in the Canyons and Caves, No. 34, Fall 2004, the excellent newsletter edited by park employee Dale Pate. Follow the link below to this interesting article. Hopefully, interpreters, as well as non-interpreters will enjoy and apply this information as needed.
Myra Barnes article
See link below for Canyons and Caves issue that appear article appeared in
Canyons and Caves, No. 34, Fall 2004
Bob Hoff, Copyright 2010