Jack worked for the Canadian government. One day, he was told to learn more about wolves. Do wolves kill lots of caribou (北美驯鹿)? Do they kill people?

The government gave Jack lots of food, clothes and guns. Then they put him on a plane and took him to a lonely place. The plane landed, put him down and left. There were no houses or people in this place. But there were lots of wolves.

People tell horrible stories about wolves. They say wolves like to kill and eat people. Jack was afraid when he thought of these stories. He always took his gun with him.

Then one day, he saw a group of wolves. There was a mother wolf with four baby wolves. A father wolf and another young wolf lived with them.

Jack watched these wolves every day. The mother was a very good mother. She gave milk to her babies. She gave them lessons about life. They learned how to catch food. The father wolf got food for the mother. The young wolf played with the children. They were a nice and happy wolf family. Jack did not need his gun any more. In a short time, he got along well with the family. Jack watched them for five months.

Later, Jack wrote a book about wolves. He wanted people to understand them and not to kill them.

During our research for this sequence, we had been told we shouldn’t even bother trying to film the Pallas’s cat in winter. Filming such an animal was said to be near impossible. We wouldn’t be able to find such a small animal in the vast steppes of Mongolia. Besides this, they’re known to be easily frightened and extremely cautious. But we wanted to surprise audiences by showing them frozen worlds that lay outside of the Poles.

Arriving in Mongolia, I was struck by its vastness. It’s unbelievable that our first day presented us with a good view of our hard-to-find target. Our guide led us to the top of a hill. More than a kilometre away in an unimpressive pile of rocks, I could see a tiny spot, a Pallas’s cat! We were so excited!

We had been blessed with extremely low daytime temperature. Pallas’s cats have the densest coat of any cat, but even so they must save their energy as much as possible. Their movements at these temperatures were especially seldom. While conditions did not look promising, we still needed to see if we could actually film them.

The cats would only appear if the sun was out. But the steppe could be hit at any time by fast and bitter winds which would make any animal that had decided to appear come to an end. The decision as to whether to hold out for the weather to pass or to have a rest was always a painful one to make.

But as the weeks went on and we spent more time with the cats, it was astonishing to see just how it was that they were able to survive in such a difficult and unpleasant environment. The longer we spent with them, the more we found ourselves falling in love with these attractive little characters and their winter lives.

As the world's resources become rarer because of continuing land development and the growing human population, the natural habitats of wild animals have continued to decrease. As a result, the survival of some species of wildlife is threatened. To help protect wildlife, a lot of practices should be carried out by environmentalist as well as the general public.

Create homes for species that are endangered because of losing their own natural habitats. Wildlife shelters should be developed, and habitats should be created in existing(现存的) national parks. Efforts(努力) should also be made to protect existing habits, such as providing food and water sources and limiting hunting. Breed(培育) endangered species in places such as zoos. Once the young animals grow up, they can be set free into the wild where they can continue to increase the population.

The general public may not realize that a species is endangered until it's too late. Educational programs making use of TV advertising and instructional meetings at national parks can be used to make the public know the situation.

The general public can help protect the wildlife by not hunting wild animals for sport or for a source of food. They should also stop supporting those who earn money from the illegal hunting of wild animals, such as hunters who kill animals for the only purpose of harvesting their body parts and selling them for money.

The public should avoid(避免) keeping wild animals as pets. This will limit the number of animals being tracked, trapped, sold and removed from their natural habitat.