Editor's note: By the end of this century, Earth may be home to 11 billion people, the United Nations has estimated, earlier than previously expected. As part of a week-long series, LiveScience is exploring what reaching this population milestone might mean for our planet, from our ability to feed that many people to our impact on the other species that call Earth home to our efforts to land on other planets. Check back here each day for the next installment.
Until about 2,000 years ago, no human had set foot on Madagascar. This wonderland of wildlife east of Africa is home to all of the world's lemurs, a diverse group of primates, most of which have foxlike faces and large eyes. Lemurs descend from animals that arrived on the isolated island between 50 million and 60 million years ago.
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