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Clicker Training for Birds
This book is the bible on clicker training for birds, and a wonderful guide to bird behavior, care, feeding, and management, clicker-style.

Don't Shoot the Dog by Karen Pryor
This is the "Bible" on positive reinforcement training, or operant conditioning, and how it works - with people, and of course with animals.

Mouse in the House
Mouse in the House is a toy designed for cats to play with when they are alone in the house. Ensuring that your cat has fun while you’re away may help to avoid separation anxiety, overeating, laziness, obesity, and even health and behavior problems.