by Karen Pryor. Ringpress Books. (2002) ISBN #1860542387
by Melinda Johnson. Sunshine Books, Inc. (2004) ISBN #1890948152
by Susan Friedman, Steve Martin, and Bobbi Brinker in: Manual of Parrot Behavior. Andrew Luescher, ed. Blackwell Publishing. (2006) ISBN #0813827493
By Barbara Heidenreich. Avian Publications. (2004) ISBN #1895270278
by Barbara Heidenreich. TFH Publications. (2005) ISBN #0793805627
by Rebecca K. O’Connor. T.F.H. Publications. (2007) ISBN-13 #978-0-7938-0582-2
by Ken Ramirez. Shedd Aquarium. (1999) ISBN #0961107499
by Paul Chance. Waveland Press Inc. (2006) ISBN #1577664728
By M. Scott Echols, DVM, Dipl ABVP - Avian Practice
Understand the natural foraging instinct of all animals. Prevent unwanted behaviors, such as feather destruction and repetitive functionless activity, i.e. stereotype behaviors. Learn how to use foraging toys; from basic to advanced; to keep birds occupied and happy.
by Karen Pryor. Scribner. (2009) ISBN#0743297768