Animals do have their own languages just as humans do. Scientists who study the evolution of language say wild chimpanzees(黑猩猩) have a more complex communication system 【小题1】 past research has shown. The researchers say the animals use over ten kinds of calls 【小题2】can be combined into hundreds of different orders.

The study team made 4,800 recordings of calls produced by members of three groups of chimpanzees【小题3】(live) in Ivory Coast’s National Park. It’s one of the last important 【小题4】 (area) of old-growth tropical forest in West Africa and home to a variety of plants and animals, Chimpanzees stay the closest to humans. They are【小题5】(intelligence) and sociable. Chimpanzees make and use tools and can【小题6】 (teach) a small amount of human sign language.

Scientists【小题7】(know) that chimpanzees use different calls in【小题8】wild since a long time ago. But the new study helped people【小题9】(far)understand the animals’ communication. Cedric was the lead writer of the study. He spoke of the chimpanzee calls, “It is not a language but it is among the most complex forms of communication【小题10】(describe) in a nonhuman world.” It can be seen that the secrets of nature are still waiting for human beings to explore.