Even after centuries of effort, some 86 percent of Earth's species have yet to be fully described, according to new study that predicts our planet is home to 8.7 million species.

20 1

27 2

5 0

7 0

81 0

4 0

9 0

8 0

40 4

29 2

9 0

8 0

21 2

11 0

13 0

25 4