One morning a deer rushed into a courtyard where a little boy was playing. The deer hooked the boy’s clothing with its antlers (角). This scared the little boy so much that he let out a loud cry which brought his mother running out to see what was happening. She came out just in time and saw the deer running off towards the mountains with her little boy.

The mother was so afraid! She ran after the deer as fast as she could, and not too far away，she found her son sitting on the grass safely. Seeing his mother, the little boy laughed and reached out his arms to her. His mother held him tight. She was so happy that she cried.

She hurried back with her dear son. When she got home, she was amazed at what she saw. The huge tree behind her house had fallen down while she was out running after the deer. The whole house was destroyed under the tee’s great weight.

Then the mother remembered the day about a year before when a deer, fleeing from a hunter, had run into her house. She felt sorry for the frightened deer, so she covered it with some clothes and let it return to the forest.

The deer seemed to understand that she had saved its life. When leaving, it kept bowing its head to her, as if it were thanking her for her kindness.

She never imagined that the deer could remember her help. It somehow knew the tree was going to fall and kill her and her son, so it came back to save them.

When the mother remembered all this, she said, “Saving the life of another is the same as saving the life of your own.”

There are about 5,000 different kinds of ladybugs in the world. They are also known as lady beetles or ladybird beetles. They come in many different colors and patterns, but the best­known in North America is the seven­spotted ladybug, with its shiny, red­and­black body.

In many cultures, ladybugs are thought to be good luck. Most people like them because they are pretty, lovely and do no harm to human beings. But farmers love them because they eat aphids and other plant­eating pests. One ladybug can eat up 5,000 insects in its lifetime!

Most ladybugs have dome­shaped bodies with six short legs. Depending on the kind, they can have spots, stripes, or nothing at all. Seven­spotted ladybugs are red or orange with three spots on each side and one in the middle. They have a black head. Ladybugs are colorful for a reason. They tell the enemy: “Eat something else! I taste terrible.” When threatened, they may play dead. Birds are ladybugs' main predators, but they are also eaten by frogs, spiders, and dragonflies.

Ladybugs are happy in many different places, including grasslands, forests, cities, suburbs, and along rivers. Seven­spotted ladybugs are native to Europe but were brought to North America in the mid­1900s.

Ladybugs are most active from spring until fall. When the weather turns cold, they look for a warm place to hibernate, such as in rotting logs, under rocks, or even inside houses. These hibernating places can have thousands of ladybugs.

The name “ladybug” was given by European farmers who prayed to the Virgin Mary when pests began eating their crops. After ladybugs came and wiped out the invading insects, the farmers named them “beetle of Our Lady”. This later was shortened to “lady beetle” and “ladybug”.

Bats quickly eat the insects that bite us and ruin our crops. They pollinate (授粉) flowers and they replant forests by spreading seeds around. But as agriculture overtakes rain forests and jungles, humans have come into conflict with one bat species: the common vampire bat (吸血蝙蝠).

Well, vampire bats are ugly little animals. They’ve got these wrinkly noses that have infrared (红外线的) heat sensors so they can detect warm blood flowing beneath the skin. They’ve got ears that can pick up the sound of low frequencies. That’s the sound of big animals breathing. And they have super sharp teeth. So when you’re bitten by one of these bats, you don’t even feel it. They also have amazing movement skills. They can fly, but they can also run with their wings,

And vampire bats mainly interact with humans who are raising livestock. They’ll drink the blood of cows and pigs and chickens. You can find newborn cows with bites from vampire bats, chicken coops that are covered in drips of blood. Children will regularly wake up with vampire bat bites on their feet. Actually, the bites aren’t that big of a health problem. The main problem is that very rarely these bats are sick with rabies (狂犬病). And they can spread this fatal disease to cattle and people.

Gerry, a scientist, does experiments where he keeps one of the bats away from food for a night. And that’s something that actually happens in the wild all the time. The bat will go out and it can’t find anything to eat. And if that happens two nights in a row, the bat could actually starve to death. But what happens is that another bat will come in and they’ll rescue that hungry bat. They’ll let out a little blood to feed it. And this behavior is seen between mothers and their children and between siblings. But surprisingly, it’s also seen between bats that aren’t related at all.