All terms in this list:

chordate: animal that at some time in its development has a notocord, a nerve cord, and gill slits

ectotherm: a cold bodied animal whose body teperture changes with the envioroment

endotherm: warm-blooded animal whose body temperature doesn't change with the envioroment

cartilage: tough, flexible, tissue similar to bone but softer and not as brittle

hibernation: period of cold weather inactivity; in amphibians, involves burying themselves in mud or leaves

estivation: period of hot dry weather inactivity; in amphibians, involves moving to more humid ares underground

amniotic egg: behavioral adaptation of reptile that allows them to reproduce on land; encloses the embryo in a moist environment protected by a leather shell and has a yolk that supplies the embryo with food

contour feather: strong,lightweight feather that gives a bird its shape and coloring and can help the bird steer attract a mate and avoid predators

down feather: fluffy feather that traps and keeps air warm against a birds body

herbivore: plant-eating animal that has incisors specialized for cutting vegetation; have large flat molars to grind it

carnivore: meat eating animal with sharp canine teeth made for ripping and tearing flesh

omnivore: plant-eating and meat-eating animals with in incisors specialized for cutting vegetables, premolars to chew meat, and molars to grind food

monotreme: mammal that lays eggs with tough leathery shells instead of giving birth to live young

marsupial: mammal that gives birth to incompletely developed young that finish developing in their mothers pouch

placental: mammal whose young develops in the female uterus until it is fully formed and ready to be born; has a placenta-a sack like organ- which supplies the embryo with food and oxygen and removes wastes