Tapeworms grow incredibly long without mouths

Tapeworms are parasitic flatworms that can grow astonishingly long, up to 33 feet, by absorbing nutrients directly from their host's intestines. Unlike most animals, they lack mouths and digestive systems, instead using their skin-like outer layer to soak up pre-digested food like sugars and vitamins. This efficient absorption along their ribbon-like body allows them to thrive.