[header] How to diagnose tapeworms in cats [title] Identify proglottids. [step] An adult tapeworm has a small head that is connected to a chain of proglottids. Proglottids are about 1/4 inch (6 mm) long. 
Each proglottid has its own set of reproductive organs, and, when fully mature, will break off and exit your cat's body in her feces. Once in the environment, proglottids will move around by increasing and decreasing in length.