interest of fish. Some resemble small fish themselves, with eye spots, a "tail" and horizontal stripes, and may even move in a similar fashion, as if facing the current (rheotaxis). When overshadowed by a fish, the larvae are forcefully expelled, becoming ecto-parasites on their unsuspecting host. Some species of Lampsilis, notably Lampsilis ovata, attract fish in the genus Micropterus, Villosa has fish-like mantle lures that attract predatory fish Percina. Cercaria mirabilis, a trematode, has an especially large larval stage, a cercarium, which looks much like a small crustacean or mosquito larva. It mimics the locomotory behavior of such animals, allowing it to be eaten by predaceous fish. Another parasitic trematode example is seen in a terrestrial setting. Leucochloridium is a genus of flatworm (phylum Platyhelminthes) which matures in the intestine of songbirds. Their eggs pass out of the bird in the feces and are then taken in by Succinea, a terrestrial snail that lives in moist environments. The eggs develop into larvae inside this intermediate host, and then must find their way into the digestive system of a suitable bird. The problem here is that these birds do not eat snails, so the sporocyst must find some way of manipulating its future host into eating it. Unlike related species, these parasites are brightly colored and able to move in a pulsating manner. A sporocyst sac forces its way into the snail's eye stalks, and pulsates at high speed, enlarging the tentacle in the process. It affects the host's behavior: the snail moves towards light, which it usually avoids. These combined factors make the sporocysts highly conspicuous, such that they are soon eaten by a hungry songbird. The snail then regenerates its tentacles, and Leucochloridium carries on with its life cycle. Wolf in sheep's clothing Zoologists have repeatedly compared aggressive mimicry to the wolf in sheep's clothing strategy of fable, including when describing jumping spiders, lacewings, ant-mimicking aphids, hemipteran bugs mimicking chrysomelid beetles, bird-dropping spiders, orchid mantises, cichlid fish, and the zone-tailed hawk which flies with vultures, enabling it to approach terrestrial prey. These animals have evolved to deceive their prey by appearing as other prey, or like angler fish and snapping turtles lure the prey by appearing as the prey's prey. See also Notes References Further reading External links Feeding behavior of the frogfishes (Antennariidae) Description, images and video of aggressive mimicry in frogfish Acoustic aggressive mimicry of cicadas by