主演：Ellen Becker-Gray Jerry Chu Kandace Cummings Olivia Judson Lance Lewman Neil Shubin Karl Steudel
简介：Earth teems with a staggering variety of animals, including 9,000 kinds of birds, 28,000 types of fish, and more than 350,000 species of beetles. What explains this explosion of living creatures—1.4 million different species discovered so far, with perhap