Female rotifers are generally a lot bigger and more developed than the males. Rofiters can be found almost literally everywhere; in the sea, in ponds or puddles, but even on the thin layer of water that remains on damp moss. In order to survive in places that sometimes dry out completely, some rotifers can undergo cryptobiosis, a condition in which they can survive very long droughts and extreme temperatures.
Rotifers can eat all sorts of things depending on the species, such as algae, bacteria, and detritus, but some are predators of protozoa or other rotifers. Rotifers have a system of “jaws” called mastax, the shape of which is often used for identification.