The Online Library of Knowledge

Animals

Animal movement

A kangaroo moves by hopping.A kangaroo moves by hopping. One of the key features of an animal is that it moves. It moves parts of its body when it opens its mouth, bends its neck or curls its tentacles. Most creatures also move about in their surroundings. They run, walk, jump, hop, slither, swim or fly. All animal movement is made possible by muscles. A gorilla has about 640 muscles, making up about two-fifths of its body weight. A few animals do not move about, at least as adults. Barnacles and mussels are stuck to seashore rocks. But they were mobile during their young, or larval, stages.



Dolphins swimmingDolphins swimmingClick to play video

Moving through water

Water is much denser than air and so resists movement more. To travel through water quickly, creatures must be smooth and streamlined so the water slips past them easily. Fish swish their tails from side to side to provide the forward propulsive force for swimming. A whale or dolphin moves its fluke tail up and down to produce the same effect. A fish’s fins and a dolphin’s flippers provide control for steering, slowing and going up or down. Penguins flap their wings and turtles their flippers to “fly” through the water.
 

Kangaroos are the only large animals that get around by hopping.

© 2019 Q-files Ltd. All rights reserved. Switch to Mobile