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characteristic Definition: what a thing has that makes the thing different from others; it identifies and individual or a group. Synonyms: attribute, feature, property, quality, trait fur Definition: the thick, soft hair that covers many mammals Breathing air with lungs is a characteristic of all mammals, birds, and reptiles. This rabbit has soft, brown fur. covering live-born Definition: what an animal has on the outside of its body such as fur, hair, feathers, or scales Definition: not hatched from an egg. Mammals have a body covering of fur or hair. Mammals like this cat are live-born. lungs Definition: the organs of an animal’s body used for breathing air You and I have lungs in our chest for breathing. warm-blooded Definition: Mammals and birds have a body temperature that stays close to the same, no matter what the temperature is of the air around them. Mammals and birds are warm-blooded animals. milk young Definition: a white liquid produced by female mammals used for feeding their babies Definition: a new animal or plant produced by a parent Baby mammals drink milk. Synonym: offspring, babies Puppies are the young of dogs. aviary feathers Definition: a large man-made enclosure where birds live and fly freely Definition: the body covering of birds Birds are the only animals that have feathers. Feathers help birds fly and also keep them warm and dry. Many birds live in aviaries at the Zoo. egg Definition: what an animal hatches from; the first stage of a life cycle All birds hatch from hard-shelled eggs that the mother bird lays. lizard Definition: a type of landdwelling reptile characterized by a tail and four legs Lizards are reptiles. hatch Definition: to break out or come out of an egg Chicks hatch from eggs. nest preen preening Definition: bird grooming; how a bird takes care of its feathers This bird is using its beak to preen the feathers on its wing. wing Definition: a safe place where some animals live and raise their young Definition: the part of a bird’s body used for flying A nest is a good place to rest. Birds have two wings. amphibian Definition: an animal that begins life in the water and moves onto land as an adult. Frogs and salamanders are kinds of amphibians. crocodiles, crocodilians Definition: a kind of reptile characterized by a large mouth with many teeth Alligators and crocodiles are kinds of reptiles. cold-blooded fish Definition: an animal having a body temperature that varies with the temperature of the air or water surrounding it. Cold-blooded animals cannot make their own body heat. Definition: an animal that lives its whole life in water and breathes with gills Fish have fins on their bodies that help them swim. moist salamander Definition: wet; damp, having a small amount of liquid Definition: a type of amphibian that has a tail as an adult The salamander has moist skin like a frog. Amphibians, like this frog, have moist skin. reptile scales, scaly Definition: a class of air breathing, cold-blooded animals with backbones Definition: what covers the bodies of reptiles and most fish Snakes, turtles, lizards and alligators are all reptiles. Reptiles have dry skin covered by scales. Scales are small, thin, flat plates that help protect the bodies of reptiles and fish. Reptiles have scaly skin. snake Definition: a kind of reptile characterized by a long, thin body with no legs Snakes have scaly skin. spider Definition: an invertebrate animal characterized by having eight legs Many spiders spin webs. turtle Definition: a type of reptile characterized by its shell Some turtles live on land. They are called tortoises. invertebrate Definition: an animal that does not have a backbone. Most of the animals in the world are invertebrates. physical adaptation Definition: an animal’s unique body part or behavior that helps it survive in its environment Definition: to do with the body Camouflage is a physical adaptation to help an animal hide in its habitat. behavior Definition: the things an animal does The behavior that allows gorillas to move around is called knuckle-walking. The quill is an adaptation to protect some animals from predators. primate Definition: any member of the group of intelligent mammals that includes humans, apes, monkeys, and prosimians A primate has hands, hand-like feet and forward facing eyes. insect snail Definition: an invertebrate animal characterized by having a shell The snail crawls slowly. worm Definition: an invertebrate animal characterized by having a long, thin body Worms do not have a skeleton. Definition: an animal that has six legs and three body parts. Many insects, like this fly, have wings. Insects are invertebrate animals. They have an exoskeleton instead of a backbone. frog Definition: a type of amphibian characterized by having no tail and having long back legs Frogs are good at jumping. gills animal Definition: the body part of fish and many other water animals used for breathing (taking in oxygen from the water) Fish use gills to get oxygen from the water they live in. Definition: a living thing that is not a plant. All animals must eat food. Most animals can move their bodies. People are part of the Animal Kingdom, too. metamorphosis backbone Definition: The changes in shape and abilities that some animals go through as they grow from young animals to adults. Definition: the column of bones located in the backs of some animals. Tadpoles change into frogs. This is a picture of their metamorphosis. Mammals, birds, reptiles, amphibians and fish are animals that have backbones. Synonyms: spine, vertebra mammal bird Definition: the group of animals including humans that drink mothers’ milk; a warm-blooded animal that has a backbone and hair or fur on the body surface Definition: an animal that has two wings and is covered with feathers Dogs, elephants, mice and bats are examples of mammals. Birds have a backbone, are warm-blooded, breathe air with lungs, produce eggs, and walk on their two legs. Most birds can fly. vertebrate beak Definition: the hard mouth part of a bird (and of some fishes and reptiles) A bird’s beak helps it get food. Definition: any animal that has a backbone Mammals, birds, reptiles, amphibians and fish are kinds of vertebrate animals.