Basic steps: Answer one or more questions on right by clicking checkbo It 's okay to check multiple bo Then click any 'search ' button. Results appear on left. Click the 'simplify ' button to get more questions. Repeat steps , narrowing down the possibilities. A 'COMPARE IMAGES ' link appears on left when under .Discover Life 's page about the biology, natural history, ecology, identification and distribution of Caterpillars -- identification guide -- Discover Life.. - This caterpillar identification guide is easy to use and accurate. Find out if your caterpillar is rare, or if it stings..