Grzimek's animal life encyclopedia / Grzimek, Bernhard

Provides information on the evolution and systematics, physical characteristics, distribution, habitat, behavior, feeding ecology and diet, reproductive biology, and conservation status of thirty-seven orders of fish, each with species accounts, and includes introductory essays on fish-related topics, and a glossary.

Presents information, research, and discoveries on a variety of topics related to evolutionary processes and mechanisms, discussing the origins of life on Earth, genetics, sexual selection, artificial selection, and other related topics.

Presents taxonomically arranged profiles of twenty-five lower metazoan and lesser deuterostome phyla, providing an introductory overview, species accounts, photos, maps, and diagrams.