Gait of earthworms

Earthworms move easily on hard and slippery surfaces. Earthworms have tiny, stiff hair-like projections, called bristles, under their body. They grab the soil with the help of these bristles. Earthworms first stretch and then contract their muscles to move. As a result, they cover only a small distance with every move. A slimy substance secreted by the earthworm helps it to move.
Earthworms eat their way through the soil. They throw away undigested food, which improves the quality of the soil.

Gait of snails

The outer skeleton of the snail, the shell, is made of calcium carbonate. The snail pulls this shell along as it moves. The snail can even hide its head inside the shell. The strong muscular foot below the shell can protrude
The under surface of the muscular foot is lubricated with mucus. Waves of muscular contractions along this surface help a snail move. The mucus also reduces the risk of injury from sharp objects. That is why snails can walk over sharp objects like blades without getting hurt.

Gait of cockroaches

The cockroach has three pairs of legs that help it to walk, and two pairs of wings that help it to fly. A cockroach moves its legs with the help of muscles near the limbs. It uses its breast muscles help to move its wings and fly. A cockroach can walk, fly and even climb. A cockroach can move in different terrains like sand and wired meshes because of the spines on its legs.

Gait of birds

A bird has a body best suited for flying. Its wings are actually modified forelimbs. Birds can fly easily with the help of these bony forelimbs. Birds have light and hollow bones. The breast bones hold the muscles of flight that help them to flutter their wings. The tail controls the direction of flight. Birds have very strong shoulder bones. They don’t have the urinary bladder, which helps them to fly easily. They can walk and perch on trees with the help of their hind limbs.

Gait of snakes

Snakes move in S-shaped loops and in a zigzag manner. They cannot move in a straight line. They have difficulty in moving on very smooth surfaces. Snakes have a long back bone and many interconnected muscles that help them to slither. They have muscles connecting the backbone, ribs and skin. Snakes move in grass, sand and water. Snakes do not have arms or legs, but even then, they can climb trees.

Gait of fish

Fish have a streamlined body, which helps them move fast in water.  
Fish swim with the help of their fins. The tail moves from side to side, and helps the fish swim in the right direction. Some fish, however, move by bending their bodies from one side to another in quick succession, which produces a thrust that helps it move forward.

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