To collect flatworms from a pond or stream or river: enclose a small amount of canned dog/cat food or a small
piece of fresh chicken/beef liver in a cheese cloth or old nylon sock. Wrap a string tightly around the cloth and
let it soak in a pond or stream overnight. Pull out the bag in the morning and collect flatworms crawling over
the bag. Keep worms in a Tupperware or other flat container and make sure to keep the water clean. Use
Poland spring or pond water where you collected the planarian.