The top 10 most endangered species are: 1) Black rhino, whose population has declined 90% to less than 3,000 due to poaching for their horns. 2) Giant panda, with fewer than 1,000 remaining in the wild in China due mostly to habitat loss. 3) Tiger, with less than 6,000 remaining in the wild and threatened by use of their parts in traditional Asian medicines. 4) Beluga sturgeon, overfished in the Caspian Sea for their high-quality caviar. 5) Goldenseal herb, facing a 30% increase in demand that threatens populations in North American forests.