Imagine Dinosaurs's video: Living Vampires

Halloween is almost here, time to bring in the scares Sea lampreys (Petromyzon marinus) are parasitic fish native to the Atlantic Ocean. Sea lampreys, which parasitize other fish by sucking their blood and other body fluids, have remained largely unchanged for more than 340 million years and have survived through at least four major extinction events. A mosquito is any member of a group of about 3,500 species of small insects belonging to the order Diptera. Within Diptera, mosquitoes constitute the family Culicidae. The word "mosquito" is Spanish and Portuguese for "little fly". Leeches are segmented parasitic or predatory worms that belong to the phylum Annelida and comprise the subclass Hirudinea. They are closely related to the oligochaetes, which include the earthworm, and like them have soft, muscular, segmented bodies that can lengthen and contract. Flea, the common name for the order Siphonaptera, includes 2,500 species of small flightless insects that survive as external parasites of mammals and birds. Fleas live by consuming blood, or hematophagy, from their hosts. Bed bugs are insects from the genus Cimex that feed on human blood, usually at night. Their bites can result in a number of health impacts including skin rashes, psychological effects, and allergic symptoms. Bed bug bites may lead to skin changes ranging from small areas of redness to prominent blisters. Oxpecker, also called tickbird, either of the two species of the African genus Buphagus, of the family Buphagidae, formerly Sturnidae (order Passeriformes). Both species—the yellow-billed (B. africanus) and the red-billed (B. erythrorhynchus)—are brown birds 20 cm (8 inches) long, with wide bills, stiff tails, and sharp claws. The vampire ground finch is a small bird native to the Galápagos Islands. It was considered a very distinct subspecies of the sharp-beaked ground finch endemic to Wolf and Darwin Islands. Vampire bats, species of the subfamily Desmodontinae, are leaf-nosed bats found in Central and South America. Their food source is blood, a dietary trait called hematophagy. Three extant bat species feed solely on blood: the common vampire bat, the hairy-legged vampire bat, and the white-winged vampire bat.