Millions of different kinds of animals live on Earth. Each one of them is connected to many other living things — animals, plants, and microscopic organisms — in ways we often don’t understand or even suspect. When an animal dies out, or becomes extinct, it can never come back. All the living things that interact with it will never be the same. Some of these animals are critically endangered — they are likely to become extinct very soon. Some can be saved if we act quickly to help them. For others it is already too late.Here are some of these animals — animals that are almost gone.