Most animals have natural enemies---other animals that like to eat them. It's night on a desert in the United States. A wolf spider is hunting. The spider is the natural enemy of beetles and other...
Keeping things even
Once, several thousand deer and a few dozen mountain lions lived together in a part of Arizona. Each year, the mountain lions ate hundreds of deer. But, during the year, hundreds of new deer were...
Keep out!
Some animals hunt for food in many different places and sleep wherever they happen to be. But other animals always sleep and hunt in the same place. This place is their territory. A dragonfly's...
Life in low places and high places
Underground caves are blacker than a lump of coal. Mountaintops are cold and bare. It doesn't seem possible for animals to live in these places. But animals do live in them. Small, white fish swim...
Nature’s clean-up crew
What becomes of the leaves that fall in the forest every autumn? What keeps them from piling up each year and covering the world with leaves? Each spring, millions of baby insects eat into the...
Why animals live where they do
You eat bacon and cereal for breakfast. A bear eats fish and berries. Some kinds of animals eat only food from plants. Some kinds eat only other animals. Some animals eat both kinds of food. But each...
Plants and animals need each other
Plants and animals trade with each other. They trade for things they both need to stay alive. Animals breathe air. The air gets changed inside their bodies. When they breathe the air out again...
Living Together
> A monarch butterfly caterpillar can live wherever there are milkweed > plants. Everywhere in the world, different kinds of plants and animals live together. Some animals eat plants they live...
The biggest and the smallest
Mammals The Kitti's hog-nosed bat is less than 1 inch (2.5 centimeters) long. The blue whale is as long as 100 of the rulers. The bat and the whale are both mammals. And so is a dog. > The blue...
Curiosities
> Platypus The platypus, or duckbill, is a mammal, but it seems to be part bird, too. It has a body like a beaver and a bill and feet like a duck. A mother platypus gives milk, as all mammal mothers...