Now most people like to keep pets in their houses. They think pets are their best friends. Do you know how to look after your pets in summer? Here are some ideas for you.
Never leave a pet alone in your car.
The air in the car is too hot in summer. If you let your pet in your car for a long time, it will lose its life as there is little oxygen in the car.
Don't keep cool all the time.
If a pet always stays in a cool room, it will get ill. You should take it for a walk in the morning or evening. But remember not to take it out on a hot afternoon.
Go to a pet hospital quickly if necessary.
When your pet is ill, you should take it to a pet hospital quickly first. You should follow the doctor's ideas and look after it carefully till it feels better.
It is not so difficult to keep pets healthy and happy. Of course, you can also get a lot of fun from it.
There is good and bad news about the number of trees on our planet. The good news is that there are seven times as many trees for everyone as we thought. A few years ago, scientists believed that the world had 400 billion (十亿) trees. However, a new study from Yale University shows that there are around three trillion trees. That's a three followed by 12 zeroes. That means there are about 420 trees for everyone in the world today.
The bad news is that thousands of years ago, the earth had six trillion trees. Humans cut in half the number of trees on the planet. Take Europe for example, it was a large forest thousands of years ago. Now much of it is cities and towns. And another 15 billion trees are lost each year.
Dr. Thomas Crow is one of the scientists from Yale University. He said the new number of trees from their study would change nothing. "The study only shows there is much to do to protect our forests." he said.
The tiger is the largest wild cat in the world. It is the king of animals. Tigers often eat 5kg of meat for a meal. Tigers can see very well in the dark. They often hunt at night. Sometimes they can eat 27kg of meat at one night. Most members of the cat family dislike water, but tigers enjoy water. They are good at swimming. Many animals live in groups, but tigers live alone (单独地)，except for (除了) mothers and their young babies. A mother tiger usually has two or three babies at one time. She takes care of them by herself.
There were eight kinds of tigers in the world, but three of them died out (灭绝). There are only about 3200 wild tigers in the world now because people kill tigers and destroy the places where they live.
These days, the Puy du Fou theme park in Westerm France welcomed six very special cleaners—Boubou, Bamboo, Bill, Black, Bricole and Baco. They are six crows (乌鸦)！As part of the daily show, the theme park has already trained the crows to pick up roses and bring them to a "princess" in a castle (城堡).
Workers at the park have taught the crows to pick up small pieces of rubbish. The crows move the rubbish (垃圾) into a small box. After belping to clean the park, they get bird food for their hard work.
"The park is very clean." Nicolas de Villiers, the head of the park, said, "The purpose of the crows is to teach people to open up their minds to think."
As a regular (定期的) visitor to the park, Simons, ever said after watching it, "OK! The birds are able to do something that we are much more able to do than them. It shows that we humans cannot throw rubbish everywhere."
Earlier this year, Josh Klein taught the crows to collect money and drop it in a special machine. After six months of training, he found that the crows could remember how to get food by working.
There are lots of different kinds of ants (蚂蚁) and they are in different colors, too. They can be red, brown or black. Some are very small, and others are quite big. They live in large groups. Some of the groups are very big.
There are different kinds of ants in a group. ▲ .
The queen lays eggs (产卵). Soldier ants keep the queen and other ants in the group away from (远离) danger. They also get food and attack ants of other groups if they need more living places. Worker ants look after baby ants, look for food and build homes. Soldier and worker ants are women. Men ants' only job is to make eggs with the queen. They also should make the eggs become baby ants.
Ants are busy. It's easy to see them moving quickly here and there. Sometimes you can see them with a leaf somewhere. Sometimes you even see two ants helping each other and moving something. But where are they going and what are they doing? People see them just walking around, but they are really important parts of the ecosystem (生态系统) . Their world is under our feet.
