Some mayfly nymphs resemble aquatic thysanurans. Immature mayflies are aquatic and are referred to as nymphs or naiads. Fed larvae molt into unfed nymphs that remain on the host. Larvae feed very quickly and detach to molt into nymphs. Fish that feed on mayfly nymphs that have bioaccumulated heavy metals are themselves at risk. They form bands of wingless nymphs which later become swarms of winged adults. These first instar nymphs can then jump away from predators. This category includes witches, elves, fairies, nymphs and house spirits. Some species are wingless and they are easily mistaken for bedbug nymphs and vice versa. Mole crickets have three life stages, eggs, nymphs, and adults. The vast majority of these creatures are friendly, such as nymphs and centaurs. We were just like wood nymphs and wood creatures. External parasites of adults and nymphs include mites. Early aquaculturists fed their brood using nymphs and silkworm faeces, and ate them. The Hellenistic cave is decorated with paintings of nymphs, water scenes, mythological figures and animals.