SAO PAULO (BHN) - According to a leading Brazilian scientist the vast majority of the earth's estimated 13 million species are still unknown.
"Only 1.75 million species have been described," said Thomas Lewinsohn, professor of ecology at the State University of Campinas in Sao Paulo state. "Unidentified species range from large mammals like this one (below) all the way down to micro-organisms, and quite literally everything in between."
Describing all species, he said, could take up to 2,000 years.
