The unusually low fertility of species like whale, humans, and elephants is most likely explained by a high expenditure in parental care.
The word "human" first appears in writing in the middle of the 13th century and derives from the Middle French humain, which means "of or belonging to man." That word itself derives from the Latin word humanus, which is supposed to be a cross between the words for "man" and "earth" (homo and humus). In contrast to birds, aircraft, or even supernatural entities, a human.
All current residents belong to the Homo sapiens race. We have only just evolved, yet because of our sophisticated technology and culture we have already colonized a wide range of environments and spread over the globe.
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