There was a time when experts in the field of anthropology commonly believed that one of the things that separated us from the "apes" was the use of tools. This notion was destroyed when chimpanzees were observed sticking bamboo reeds into ant and termite hills, pulling them out slowly and then eating the bugs stuck to the reeds. As interesting as that observation was, humans have certainly advanced much more rapidly in their development and use of tools.
Researchers have also suggested that language distinguishes us from other animals. There are studies regarding the signals that dolphins and whales send to each other underwater, but we don't fully understand exactly what they mean. Chimpanzees were found to be capable of learning sign language, but they showed little interest in refining or developing it further. For the time being, it seems safe to say that humans use language the most efficiently of any creatures.
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Language lovers might consider visiting the websites of two important organizations. The first is the Linguistic Society of America, and the second is the International Linguistic Association.