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adaptation (physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light) amniotic egg A shelled, water-retaining egg that enables reptiles, birds, and egg-laying mammals to complete their life cycles on dry land anthropoid any member of the suborder Anthropoidea including monkeys and apes and hominids behavioral adaptation an inherited behavior that helps an organism survive binocular vision ability to merge visual images from both eyes, which provides depth perception and a three-dimensional view of the world bipedal having two feet camouflage the act of concealing the identity of something by modifying its appearance carapace hard outer covering or case of certain organisms such as arthropods and turtles cerebral cortex the layer of unmyelinated neurons (the gray matter) forming the cortex of the cerebrum crop a pouch in many birds and some lower animals that resembles a stomach for storage and preliminary maceration of food diversity (n.) difference, variety; a condition of having many different types of forms ectotherm an animal whose body temperature varies with the temperature of its surroundings endotherm An animal whose body controls and regulates its temperature by controlling the internal heat it produces gizzard thick-walled muscular pouch below the crop in many birds and reptiles for grinding food hominid characterizing the family Hominidae, which includes Homo sapiens sapiens as well as extinct species of manlike creatures hominoid a primate of the superfamily Hominoidea locomotion the power or ability to move mammals vertebrates that live on land, fur or hair covers body, live birth, warm blooded mammary gland milk-secreting organ of female mammals marsupial mammals of which the females have a pouch (the marsupium) containing the teats where the young are fed and carried migration the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding mimicry the resemblance of an animal species to another species or to natural objects monotreme A mammal that lays eggs opposable thumb thumb that enables grasping objects and using tools placenta the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus plastron (zoology) the part of a turtle's shell forming its underside reptiles vertebrates that live on land, scales cover body, lay eggs, cold blooded subcutaneous fat layer of fat cells beneath the skin that helps conserve body heat