Another well-organized First Look. . ., this time at invertebrates. With absolutely picked-clean fish and chicken platters as the jump-off, we learn the basic differences between vertebrates and invertebrates and go on to a gallery of various phyla and classes. The format--clearly labeled drawings and prodding text: ""Can you see any difference?"" ""Did you find it?""--encourages careful examination, and a final review brings all the information together. Many difficult words are defined and spelled phonetically, but ""sac"" is unexplained and sponge is unaccountably substituted for porifera. Although a sense of evolutionary movement towards complexity is absent--protozoa appear toward the end--this is a reasonable introduction with calculated incentives for reader participation and observation.