Human beings act in a different way from 1 of animals just because they can speak while animals cannot. Even the cleverest animals cannot do things which to us seem very 2 and which small children, as soon as they learn to talk, would be able to do.
A German scientist, who 3 experiments for many years with big apes, found that his apes could use his sticks as tools to pull down bananas which they could not 4 . But they only used the stick to get a banana when both the banana and the stick were in view at the same time. If the banana was in front of them and the stick was behind them, they could not use the stick. They could not keep the banana 5 enough in mind to look around and then pick up the stick and use it.
The 6 for this is clear. We have words for banana and stick which help use to think about these things when they are not in 7 . Even a small child knowing the words “banana” and “stick” has an idea of their relationship and is able to think “stick” together with “banana” and to remember this long enough to pick the stick 8 behind and use it on the banana.
9 to speak, animals cannot keep their knowledge of things for long. That is why they often interrupt one line of action to do something else and later forget it completely. Human beings, on the other hand, use 10 and are able to do one thing continuously.
Koalas look like teddy bears, 11 they are not bears at all. They are really animals called marsupials.
These animals carry their young in pouches, like kangaroos 12 .
Koalas live in the forests of Australia. They spend most of their lives in eucalyptus trees. They 13 never come down even for a drink of water. In fact, their names means “no drink.” The koalas have a 14 of knowing which trees they can feed on safely. They eat each leaf the same way. 15 , they bite the leaf off the stem and then they chew it from base to 16 .
When a koala is born, it is less than an inch long. The baby crawls into the mother’s
17 right away and stays there for six months. After that, the baby rides piggyback or hangs on
18 the mother’s front paws and legs. Young koalas stay with their mothers for at least a year.
The koala is a strong climber. Its paws end with sharp claws, 19 he can get a good grip on tree branches. Koalas sleep in the eucalyptus trees on most of the day and eat at night. Koalas may live alone or in small 20 . Males sometimes use their sharp claws as weapons. Most of the time, koala families live together peacefully.