Animals move in many ways.
Some swim in the sea. Some fly in the sky.
Some run on the land. Moving helps them find food. It helps them stay safe. How do you move?
Animals move to find food.
They also move to stay safe.
Some swim through the water. Fish use their tails to push.
Other animals fly in the air. They use wings to lift up. Some animals move on land. They can run or jump. A small frog can jump very far. Moving is a big part of life.
Animals move to find food or mates. They also move to stay safe from predators. This movement is called locomotion.
Many animals live in water. Fish often move by waving their bodies side-to-side. This motion ends at a large tail fin. This helps them push through the water. Some animals, like squid, use jet propulsion. They take in water and squirt it out fast to move.
Other animals move in the air. Flying animals must be light. They use wings to create lift. Lift is a force that pushes them up.
Some animals do not flap wings. They use gliding to stay in the air. This helps them travel long distances without much work.
On land, animals use legs to walk or run. Some animals, like frogs, use jumping. This is called saltation.
Some animals do not have legs. Earthworms move by using muscle contractions. They move in a rhythmic way to crawl along.
Animals move from one place to another using many different methods. This movement is called locomotion.
Living things move for many important reasons. They might search for food or look for a mate. Moving helps them find a good home or escape from predators. Some animals use their own power to move by running or swimming. Others use passive locomotion, which means they rely on their environment. For example, some spiders use kiting to move with the wind.
In the water, animals must deal with drag and buoyancy. Buoyancy helps an animal stay afloat if it is less dense than water. Many fish move by oscillating their bodies from side to side. This wave motion ends at a large tail fin to create thrust.
Other animals use different ways to travel through the sea. Cephalopods use jet propulsion by squirting water out in a fast burst. Some sea creatures, like echinoderms, use tube feet to walk on the bottom. These feet use suction and mucus to stick to surfaces.
Moving through the air is a very hard job because of gravity. Flying animals must create lift to stay airborne. They often use wings to push against the air to go up.
Some animals do not flap their wings constantly. They use gliding, or volplaning, to travel horizontally while they descend. Some birds even use soaring to stay up using rising air currents. This allows them to fly without using much energy at all.
Flight has evolved many times in history. Insects were the first group to fly about 400 million years ago. Pterosaurs followed about 220 million years ago. Birds evolved flight about 160 million years ago. Finally, bats developed flight around 60 million years ago.
On land, animals need strong muscles and bones for support. Some animals use jumping, also called saltation, to move quickly.
Kangaroo rats can leap up to 2.75 meters in a single jump.
Locomotion is linked to how animals survive in their homes. Migratory animals like the Arctic tern need to move long distances. They use methods that cost very little energy per unit of distance. Other animals need to move very fast to escape danger. This type of movement costs much more energy but is very quick.
Whether it is a beetle larva or a dolphin, every movement is a way to stay alive.
Locomotion is the scientific term for how animals move from one place to another. In the field of ethology, which is the study of animal behavior, researchers look at how different species navigate their worlds. Animals move for several vital reasons. They must find food and locate mates. They also seek out suitable microhabitats or try to escape from predators. Because movement is essential for survival, natural selection has shaped the specific mechanisms animals use.
There are two main categories of movement: self-propelled and passive locomotion. Self-propelled locomotion occurs when an animal uses its own energy to move. This includes running, swimming, jumping, flying, and soaring. Passive locomotion is different because the animal depends on its environment for transportation. Examples include sailing, kiting, or riding on other animals, a process known as phoresis. The structures used for these movements, such as legs, wings, or fins, are called locomotory organs.
Aquatic locomotion requires animals to manage buoyancy and drag. Buoyancy is the ability to stay afloat. If an animal is less dense than water, it stays afloat with little energy. However, moving horizontally through water is difficult because drag is much greater than in air. Many fish use a fusiform body shape, which is torpedo-like, to move efficiently. Most fish generate thrust by oscillating their bodies from side to side. This wave motion ends at a large tail fin. Other fish, like electric rays, use pectoral fins for labriform swimming.
Cephalopods and marine mammals use different aquatic strategies. Some cephalopods use jet propulsion. They take in water and then squirt it out in an explosive burst to move fast. Marine mammals, such as dolphins, oscillate their bodies in a dorso-ventral direction, which means up and down. Dolphins can also engage in interesting behaviors like surfing on waves. Benthic locomotion refers to animals that live on or near the bottom of the sea. Echinoderms use tube feet with suction-pad tips to move. They use muscle contractions and mucus to create adhesion to the seabed.
Aerial locomotion is a major challenge due to gravity. Flying animals must generate lift to overcome the downward pull of the earth. Active flight has evolved independently at least four times in history. Insects were the first to fly, approximately 400 million years ago. Pterosaurs followed around 220 million years ago. Birds evolved flight about 160 million years ago. Bats were the last major group to develop flight, roughly 60 million years ago.
Some animals use gliding, or volplaning, instead of constant flapping. Gliding is a form of heavier-than-air flight that uses no thrust. It allows an animal to travel horizontally while descending. Many animals glide, including flying squirrels and certain snakes. Some birds use soaring to stay aloft without flapping. They use rising air currents like thermals or ridge lift. Albatrosses use dynamic soaring near the surface of the sea. Even some aquatic animals like the Pacific flying squid use gliding to escape predators.
Terrestrial locomotion requires a strong skeletal and muscular framework for support. On land, animals must overcome inertia and maintain balance. Some animals use saltation, which is the scientific term for jumping. While many animals run, only a few use jumping as their primary way to move. Examples include kangaroos and rabbits. The Australian rocket frog is an incredible jumper. It can leap over fifty times its own body length.
Locomotion methods are often specialized based on energy needs. Migratory animals, like the Arctic tern, travel vast distances. Their locomotion mechanisms are designed to cost very little energy per unit of distance. In contrast, animals that must escape predators quickly use energetically costly locomotion. These methods are much faster but require more fuel. Whether an animal is a small beetle larva or a large whale, its method of movement is a specialized tool for survival.
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