Many people pollute the environment: forests, air. They throw garbage on the ground, and do not remember that the forest is a house for animals. When we cut down the trees - we destroy the houses of our animals, their food. When we go by our cars or fly by airplanes, we work in factories, we pollute the environment, which means we poison our animals.Many animals are listed in the red book, because they die and they remain few. For such animals are watched and guarded more than others.
There are many animals in danger nowadays. For example Koalas, who live in Australia are in a great danger because it is only 100 000 koalas left on Earth. This seems to be many, but more than 600 000 of koalas were killed because of hunting in 1927. Now the main danger for these animals is increasing of eucalyptus forests because of people. Also enormous amount of koalas are infected with bacterias they got through time and many koalas die from diseases.
