Scott Leslie

Scientists estimate that the total biodiversity on Earth is between 10 million and 100 million species. Of these, just over 1.6 million and counting have actually been catalogued and described. One percent, or 16,306, of those species are threatened with extinction, about one-fifth of them critically. Of this group, some have vanishingly small populations in the double or single digits. A few species, including the Pinta Island giant tortoise and...