The animal world

We do not know many species of animal there are,as people are discovering new ones all the time; but most scientisrs think that tere are about ten million different animal species in the world.

Giraffes are the tallest animalon Earth. A large adult male giraffe can be up to 6 metres tall.Thanks to it can eat the leaves from the tops of trees.
 The smallest animals are called protozoa,which have only one call,and are so small that we cannot see them without a powerful microscope.
 The smallest mamal is Savi's pygmy shrew- it is only 6 centimetres long,including its  tail.
 The goliath from of West Africa can be up to 75 centimetres long,and weight about 3 kilograms.The goliath beetle is probably the world's largest beetle - it weight more than 100 grams - about the same as two eggs.

The Ostrich is the world's largest bird.An adult Ostrich is more then 2.5 mertes tall,but it cannot fly.

The bee Hummingbird is probably the world's smallest bird - it is just 5 centimetres long and weighs less than 2 grams: is can stay still in the air by moving its wings twenty to fifty times a secend. One of the largest birds which can fly is the Souch American condor: its wings are three metres from end to end.

There are more than fifty different types of kangaroo in Australia. When it is born,a baby kangaro is less than 2.5 centimetres long: but an adult kangaroo can grow to more than 2 metres in height.

In the mid-1860s,there were about 13 million Bisson living in North America. By the mid-1880s,there were only a few hundred.Today there are about 50,000 Bison in America,living in special parks.