The document discusses endangered animals and defines them as species that are no longer widely found in the wild. It provides examples of endangered animals like pandas, tigers, Amur leopards, rhinos, and gorillas. Specific details are given about the critically endangered Amur leopard, of which only 60 remain, and eastern gorillas, of which there are only around 5,000 left. The main causes of animals becoming endangered are identified as pollution and loss of habitat.