Veretebrate - an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibian.. invertebrate - An animal lacking a backbone, such as an arthropod, mollusk, annelid, coelenterate, etc. The invertebrates constitute an artificial... swim bladder - A gas-filled sac present in the body of many bony fishes, used to maintain and control buoyancy.
Gills - The paired respiratory organ of fishes and some amphibians, by which oxygen is extracted from water flowing over surfaces within or... carapace - The hard upper shell of a turtle or crustacean.
Plastron - A large pad worn by a fencer to protect the chest. A lancer's breast covering.
Craniata - Craniata (sometimes Craniota) is a proposed clade of chordate animals that contains the Myxini (hagfish), Petromyzontida (including lampreys), andGnathostomata (jawed vertebrates) as living representatives. As the name suggests, Craniata are animals with a (hard bone or cartilage) skull in Chordata.
Acrianata - poikilothermous - poikilothermic: of animals except birds and mammals; having body temperature that varies with the environment.
Homoiothermous - homoiothermic: of birds and mammals; having constant and relatively high body temperature.
Claw - A curved pointed horny nail on each digit of the foot in birds, lizards, and some mammals. hoof - The horny part of the foot of an ungulate animal, esp. a horse. nail - a horn-like envelope covering the dorsal aspect of the terminal phalanges of fingers and toes in humans, most non-human primates, and a few other mammals. feather - Any of the flat appendages forming a bird's plumage, consisting of a partly hollow horny shaft fringed with vanes of barbs. hair - Any of the fine threadlike strands growing from the skin of mammals and other animals.