For up to 40 students (in 10 groups) Time Required: 1.5-2 hrs, which can be conducted over two lab periods. The objective of this experiment is to introduce students to the concept of distribution of organisms in a resource gradient, and to help them learn the difference between kinesis and taxis. Requirements: Stereo microscope; spring water; petri dishes. CONTENTS: Coupon for pillbugs and Drosophila wild type, Petri plates, Filter paper, Acetocarmine stain, BugOut anesthetic solution, Instant Drosophila medium, 30 Drosophila culture tubes, 30 Foam lids, 35mm projectible slide of Drosophila salivary gland chromosomes, Complete reagent use instructions.