Why do human beings look a bit like monkey or apes ? Why are dolphins good swimmers? Why do giraffes have long necks ? The answer to all these questions is evolution. Evolution is the way life changes through time. All living things are connected together like branches in a tree. Plants and animals are related to one another through their ancestors. For example, […]
The human heart is a muscle that lies left of the chest . It has about the size of afist . The heart is like a pump that sends blood around your body. The blood gives you the oxygen you need . An average heart pumps about 70 millilitres of blood into your body with every beat . That’s about 5 litres every minute or about […]
The fastest bird is the peregrine falcon . It can swoop down on its prey at a speed of 300 km an hour. The largest bird is the ostrich. It can grow as tall as 2.5 metres and it weighsabout 150 kg. The smallest bird is the hummingbird. It measures about 5 cm and weighs only 3 grams. The greatest traveller is the Arctic tern. It […]
Aquatic Birds These are birds that spend most of their time over oceans or in saltwater. They get their food from animals and plants of the sea. Some birds, like pelicans, often switch between salt and freshwater habitats. Albatrosses, penguins, pelicans, ducks, geese and swans belong to this group. Wading Birds Many birds have long legs and live […]
Birds are animal with feathers. Because they can fly, they are the fastest animals on Earth . Some birds can reach speeds of up to 160 km an hour. However, not all birds can fly. Some birds, like ostriches can run and penguins can swim. There are about 10,000 kinds of birds. The smallest bird is the hummingbird which […]
Crocodiles belong to the largest living reptiles. They, and their look-alikes , the alligators, have a long body that looks like a cigar, short legs and long, powerfultails to swim. They have long snouts and sharp teeth to kill and eat their victims. Crocodiles live in tropical countries all over the world. They prefer shallow water, rivers and swamps. Using their webbed feet, they can walk on […]
Snakes are animals with a long body and without legs. They move around bysliding. They have eyes that are always open and a narrow tongue that they often move in and out. Snakes can live almost anywhere—in deserts, forests, oceans, rivers and lakes. However, they cannot live in very cold places like high mountains or polar regions.Most snakes […]
Turtles are the only reptiles with shells. Most of them can pull their head, legs and tail into them and protect themselves from attacking enemies. Turtles cannot live in cold areas—but they live almost everywhere else—in deserts, grasslands, lakes and seas. Some turtles live only on land, but others spend most of their life in the water. When turtles swim […]
A reptile has a dry and scaly skin and it breathes through its lungs. There are about 6,000 different types of reptiles. The most common ones are alligators,crocodiles, lizards, snakes and turtles. Reptiles are cold-blooded. Their body temperature stays the same as the outside temperature around them. In hot places most reptiles look for shady areas during the day. Many species are active at night. In cold […]
The human brain is a very powerful organ. It controls all parts of the body andallows you to think, feel, move your arms and legs and it helps you stay healthy. The brain looks like a pink sponge and consists of a mass of nerve cells. It isprotected by the skull. An adult’s brain weighs about 1.5 kilograms. Main Parts of the Brain Cerebrum The […]