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Actually, there are a variety of methods to know about the existence of different species. In some cases, scientists rely on past writings from respected men and women who had discussed those species. In other cases, as modern biologists, entomologists, oceanographers, and others make interesting new discoveries, they want to determine links to past species or find out how old a particular discovery really is. A common technique is to use carbon dating to determine how old a species is/was. Some scientists do extensive research on the history of a given species, looking at what information exists about it and what new information has been published. There are new species being discovered on a regular basis, and I enclose a link to a publication that follows these discoveries.

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