This colorful, exciting program explores the fascinating world of invertebrate animals. Live-action footage conveys basic features of the major invertebrate groups. Special attention is paid to the body structure and physical features of simple animals. The following groups of invertebrates are addressed: poriferans, cnidarians, platyhelminthes, nematodes, annelids, mollusks, arthropods, and echinoderms. Other terminology includes: backbone, sponge, sea anemone, radial symmetry, planaria, earthworm, bilateral symmetry, exoskeleton, segmented body, and jointed appendages.

Originally released by Visual Learning, 2008. Streaming video file encoded with permission for digital streaming by Infobase on April 18, 2015.

What Are Simple Animals? (2:42); --Exploring Sponges and Cnidarians (1:45); -- Worms (2:11); -- Investigating Mollusk (0:47); -- Arthropods Around Us (1:13); -- Understanding Echinoderms (1:05); -- Summing Up (1:49); -- Video Assessment (1:41); -- Credits: Simple Animals (0:52); .