Living in the gut
Cestoda is a class of parasitic worms in the flatworm phylum, known as tapeworms. Their bodies consist of many similar units known as proglottids—essentially packages of eggs which are regularly shed into the environment to infect other organisms. They live in the intestines of many animals, sufficiently far down the digestive tract to be bathed in pre-digested food. Lacking guts of their own, they need only the means to stay fastened to the gut wall and absorb what is around them.
