A notable introduction that provides clear discussion of animal intelligence, learning, thinking, and consciousness and that describes experiments conducted with various animals. A final section considers problems of language and philosophical issues related to animal intelligence. The many details are fascinating as well as illuminating: ""Pigeons can remember how to respond to at least 320 different slides that are unconnected by any human concept and can remember how to respond to each of 160 different slides for at least two years."" Or: "". . .chimps learning ALS [American Sign Language] invent their own words to describe new experiences."" Excellent science writing on a timely topic. The careful documentation includes sources of quotations and research sources. Glossary; suggested reading; index.