Study animal behavior with this affordable choice chamber! A connecting tunnel between two chambers allows small invertebrates to move back and forth, demonstrating habitat selection and preference influenced by abiotic and biotic factors. If one side is moist and dark and the other dry and bright, which side would an isopod prefer? What if both sides were dark and moist, but with different substrates like sand, mud, leaves, or rocks? Test biotic factors by introducing bacteria. Escape-proof, with two separate removable lids, they allow your students to predict and observe animal behavior right in the classroom. Great for AP Biology activities! Each dish is 3¼" diameter and ½" deep, and the passageway is ½" wide.