Yunnan province is the only “biodiversity oasis” on the Tropic of Cancer. It has 313 species of beasts, or 16.1 percent of the world’s total, 945 species of birds, or 15.2 percent of the world's total; 617 species of freshwater fish, or 18.2 percent; and 2,273 species of vertebrates, or 13.8 percent.
