| There are an astounding number of ways in which | | | | However, the wings of bats, birds and flying |
| animals move on the land, in the air and in | | | | reptiles are alike in having bones. An insect's wing, |
| water.Land-dwelling mammals can to walk, run and | | | | like an insect's body, has no bones at all. The |
| jump. Salamanders, turtles and lizards also walk, | | | | veins that strengthen its wing are really air tubes |
| but are often said to crawl. Termites and ants are | | | | with strong walls.A great many animals also live in |
| among the many insects that walk a great deal | | | | the water, primarily because there is much more |
| too. Grasshoppers and crickets jump, but they | | | | room for them than on land. Mammals, such as |
| also walk about slowly when they are eating. Even | | | | dolphins and whales, live only in the water. Many |
| flying birds must be able to walk or hop on land. | | | | birds do a great deal of paddling about in the |
| The garden snail produces a watery liquid that | | | | water. Reptiles, like turtles and amphibian animals, |
| serves as a private lake. This snail rolls through | | | | like frogs, can also live half their lives in a body of |
| this lake by contracting muscles that move its | | | | water. But most of the swimming animals belong |
| skin. This is also another form of animal | | | | to the class of fishes. The movement of a fish's |
| movement on land.Many animals live in the ground | | | | tail fin helps propel a fish through the water. Yet |
| and must get from place to place. Moles and | | | | many fish can still swim even if most of the tail |
| other burrowing animals dig their way through the | | | | fin is a bitten or cut off.They can push |
| earth rapidly with shovel-like legs. Earthworms | | | | themselves through the water by twisting their |
| often eat their way through. When the soil is | | | | bodies from side to side. Some fish can also |
| loose, they push through it in the same way that | | | | move forward or backward by means of their |
| they move on the surface of the ground. A | | | | side fins. Other animals move through the water |
| worm also moves about by digging into the | | | | by jet propulsion. Squids and cuttlefish suck water |
| ground and making itself longer and then shorter. | | | | into their bodies and then squirt it out. This shoots |
| In this way it pulls itself ahead.Several other | | | | them forward. Jellyfish also swim by jet |
| animals fly through the air to transport | | | | propulsion. They open their jelly umbrellas and |
| themselves. Others, like flying squirrels, flying | | | | then rapidly close them. When the stream of |
| frogs, flying fish and flying lizards do not really fly | | | | water gets out, the jellyfish is pushed forward. |
| but instead glide through the air. The best gliders | | | | Many tiny animals row themselves through water. |
| are the flying fish that leap from the water with | | | | They have tiny hairs called cilia which act as oars. |
| such force that they can glide as far as 50 | | | | Other tiny creatures have whiplike threads with |
| yards.A true flying animal has the ability to propel | | | | which they pull themselves forward.There are still |
| itself through the air by beating its wings against | | | | more curious ways in which animals move. Some |
| the air. Only four groups of animals have | | | | ride from place to place on other animals, like the |
| produced species that can truly fly: they are the | | | | remora fish. It fastens itself onto sharks or other |
| bats, the birds, the insects and the flying reptiles | | | | big fish so that when the sharks kill another fish, |
| that died out with the dinosaurs. Each group has | | | | the remora frees itself to go after a part of the |
| its own kind of wing design and aerodynamics. | | | | meal. |