Many animals and birds on the Earth are disappearing. Many of them are in danger. For ex. some people often hunt tigers for fun and for their beautiful skin. So, we can find their names in the Red Book.
The problem of disappearing animals is very important nowadays. We have a lot of rare animals on the planet. Some of them are tigers, elephants, crocodiles, bears, monkeys, eagles, whales, butterflies, and so on. All these animals must be protected.