| aquatic |
When an animal or plant is aquatic, it lives or grows in or on the water. [1/2 definitions] |
| ark |
(sometimes capitalized) in the Bible, the large boat built by Noah to save his family and two of every animal from a flood sent by God. [1/2 definitions] |
| arthropod |
An arthropod is a kind of animal. Arthropods have hard shells on the outsides of their bodies and no bones inside their bodies. They often have six, eight, or ten legs, and their legs are made of parts that are joined together. Some arthropods have even more than ten legs! All insects are arthropods. Spiders, scorpions, lobsters, and crabs are arthropods too. |
| back |
the part of the body of a human or animal that is on the opposite side from the chest and between the neck and hips. [1/10 definitions] |
| badger |
A badger is a strong animal with thick fur. Badgers have stripes on their faces. They also have sharp teeth and long claws. A badger's body is a little long, but it has short legs. A badger usually has its home in the forest. |
| barnacle |
a small sea animal that attaches its shell to rocks, the bottom of ships, docks, and other objects in shallow parts of the ocean. Barnacles float freely in the ocean when they are young. They develop shells with sharp edges as adults. Barnacles are kinds of crustaceans. |
| bear1 |
When a person or animal bears something, they carry it. [2/6 definitions] |
| bear2 |
A bear is a large, powerful animal with thick fur, sharp claws, and a short tail. Bears usually live in the forest or in cold areas of the world. Most people are afraid of bears because they can be very dangerous. Some kinds of bears are black bears, grizzly bears, and polar bears. |
| beard |
hair on an animal that looks likes a man's beard. [1/2 definitions] |
| beast |
any animal other than a human, especially a mammal with four legs. [1/2 definitions] |
| beaver1 |
A beaver is an animal that lives in and out of the water in rivers and lakes. It has long, sharp front teeth that can cut wood, and it has thick brown fur and a wide flat tail. Beavers are famous for working hard to make their homes out of wood. |
| behavior |
the typical actions of a person, animal, thing, or group, either in general or in certain situations. [1/2 definitions] |
| belly |
the front of a person or underside of an animal; stomach. |
| bird |
an animal with two wings, two feet, and a body covered with feathers. Most birds can fly. Birds are warm-blooded animals with skeletons inside their bodies. Birds lay eggs with hard shells. Robins, eagles, chickens, and ostriches are a few of the many kinds of birds. |
| birth |
the act of bringing a new baby or baby animal into the world. [1/3 definitions] |
| bison |
a similar animal that lives in Europe. Both kinds of bison are closely related. [1/2 definitions] |
| black sheep |
Someone who is very different from the rest of their family or group is sometimes called "the black sheep." Sometimes the other members of the family or group are ashamed of this person because they do bad things or they are not as successful as they are. Sometimes a person is called a "black sheep" just because they think very differently from the rest of the group and want to have a different kind of life. In a real group of animal sheep, most of the sheep have a light color. Only a few sheep in the group might have a dark color. |
| blue whale |
a mammal that lives in the ocean. Blue whales are the largest kind of animal that has ever lived. They can grow up to 100 feet long and weigh up to 150 tons. Their large mouths have baleen instead of teeth. Blue whales use baleen to filter lots of very small food such as shrimp from ocean water. |
| body |
all the physical material that makes up a person or animal, including limbs, organs, tissue, and other parts. [2/5 definitions] |
| bolt1 |
When a person or animal bolts, they suddenly start to run away very fast. [1/5 definitions] |
| bone |
the hard tissue that forms the skeleton of a person or animal. [1/2 definitions] |