Habitats and Adaptation

Every living thing has a home

Imagine trying to live underwater with no special equipment, or in a scorching desert with no water. You could not survive for long. Yet a fish thrives underwater and a camel strolls happily across hot sand. How? The answer is two big ideas: habitats and adaptation.

A habitat is the natural place where a plant or animal lives. A good habitat gives a living thing everything it needs to survive: food, water, shelter and a safe place to raise young. A pond is a habitat for a frog. A rainforest is a habitat for a parrot. A rotting log is even a tiny habitat for woodlice and beetles.

Different habitats have very different conditions — hot or cold, wet or dry, light or dark. And that is where adaptation comes in.

What is an adaptation?

An adaptation is a special feature or behaviour that helps a living thing survive in its particular habitat. It is like having the right tools for the job.

Adaptations come in two kinds:

• Body adaptations are parts of an animal's body, like a duck's webbed feet for paddling, or a giraffe's long neck for reaching high leaves.
• Behaviour adaptations are things an animal does, like birds flying to warmer places in winter, or animals sleeping through the cold months. You can read about both in Migration and Hibernation.

The key idea is that an adaptation always matches the habitat. The same feature that helps an animal in one place would be useless or even harmful somewhere else.

How adaptations happen

Animals do not choose to change their bodies. So how does a camel end up with a hump, or a fish with gills?

Adaptations build up slowly, over many generations. In any group of animals, some are born slightly better suited to their surroundings than others. Those better-suited animals are more likely to survive, find food, and have babies — and their babies inherit those helpful features. Over a very long time, the whole group becomes better and better matched to its habitat. This gradual change is part of a bigger idea you can explore in Evolution and Natural Selection.

Surviving the heat: the desert

The desert is scorching hot by day, cold at night, and there is very little water. Living things here have remarkable adaptations.

The camel is a desert superstar. Its hump stores fat for energy when food is scarce. Its wide feet spread out so it does not sink into soft sand. It can close its nostrils against blowing sand and go for days without drinking. A cactus survives by storing water in its thick stem and shrinking its leaves into spines, which lose less water and protect it from being eaten. To learn how whole communities survive there, see Deserts and How Life Survives.

Surviving the cold: the polar regions

At the freezing poles, animals must keep their warmth in. The polar bear has thick fur and, under its skin, a layer of fat called blubber that traps heat like a cozy blanket. Its white coat also helps it blend into the snow while hunting. Penguins huddle together in big groups to share warmth and have waterproof feathers for diving into icy water.

Surviving in water: the ocean

In the ocean, animals must move through water and breathe underwater. Fish have smooth, streamlined bodies to glide easily, fins to steer, and gills to take oxygen from the water. A dolphin is a smooth swimmer too, though it must surface to breathe air. There is a whole watery world of adaptations to explore in Oceans and Sea Life.

The art of hiding: camouflage

One of the cleverest adaptations is camouflage — colours and patterns that help an animal blend into its surroundings. A stick insect looks exactly like a twig. A polar bear is white like the snow. A tiger's stripes break up its shape among tall grass and shadows. Camouflage helps prey hide from predators, and helps predators sneak up on their prey without being seen.

Try it yourself: a habitat hunt

The best way to understand habitats is to explore a real one near you.

1. Choose a small outdoor habitat: a corner of a garden, a patch of park, a hedge or a single tree.
2. Take a notebook and pencil. Look closely — under leaves, on bark, in cracks. Use a magnifying glass if you have one.
3. For each living thing you find, write down: Where exactly was it? What might it eat there? How does it stay hidden or safe?
4. Try to spot one adaptation. Is a leaf shaped to catch rain? Is a bug coloured to match the bark? Does a spider build a web to trap food?

Always look gently and leave creatures where you found them — that spot is their home. Back inside, draw your favourite living thing and label one adaptation that helps it survive in its habitat. You will start to notice that nothing in nature is there by accident: every feature is a clue to how that living thing survives right where it lives.