Available 3 ways: 1) by itself 2) with the KoKo Doll in the package or 3) inside the book for the parent (see above) KoKo, an irresistible little unisex bear learns how nice a dry diaper can be. This book gently covers all the issues of potty training to help a child know what to expect and what's expected. It presents a reassuring story for children. Color illustrations by Jane Prince.

This unisex doll and read-aloud story shows children that toilet training is only a part of the larger process of growing up. The book warmly conveys the family's happiness with Koko's successes while also allowing for hesitations.

A personal, scientific account of the ground-breaking Project Koko discusses Patterson's controversial experimental program of teaching sign language to an ape.

This thorough revision and update of the popular second edition contains everything the student needs to know about the psychology of language: how we understand, produce, and store language.

"Comprehensive and up to date, this tightly edited volume belongs on the desks of researchers and students in developmental psychology, comparative psychology, animal behavior, and evolutionary psychology, and will also be of interest to anthropologists. It is a richly informative text for advanced undergraduate- and graduate-level courses."--BOOK JACKET.