1. Tiger
New studies indicate that there may be as few as 3,200 tigers (Panthera tigris) left in the wild. Tigers occupy less than seven per cent of their original range, which has decreased by 40 percent over the past ten years. Continuing deforestation and rampant poaching could push some tiger populations to the same fate as its now-extinct Javan and Balinese relatives in other parts of Asia. Tigers are poached for their body parts, which are used in traditional Asian medicine, while skins are also highly prized. Additionally, sea level rise, due to climate change, threatens the mangrove habitat of a key tiger population in Bangladesh’s and India’s Sundarbans.
2. Polar Bear
The Arctic’s polar bears (Ursus maritimus) have become the iconic symbol of early victims of climate-induced habitat loss. Designated a threatened species for protection by the Endangered Species Act in the US, many polar bear populations will be vulnerable to extinction within the next century if warming trends in the Arctic continue at the current pace.
3. Pacific Walrus
The Arctic’s Bering and Chukchi Seas are home to the Pacific walrus (Odobenus rosmarus divergens), one of the latest victims of climate change. These animals use floating ice for resting, birthing and nursing calves, and protection from predators. With Arctic ice melting, the Pacific walrus is experiencing habitat loss to the extent that in September 2009, the US Fish and Wildlife Service announced that adding the walrus to the Endangered Species Act may be warranted.
4. Magellanic Penguin
Once threatened primarily by oil spills, Magellanic penguins (Spheniscus magellanicus), now face a larger threat as fish are displaced by warming ocean currents, forcing the birds to swim farther to find food. Last year hundreds of Magellanic penguins washed up on beaches around Rio de Janeiro, many emaciated or dead. Scientists have speculated that changes in ocean currents or temperatures, which may be related to climate change, could be responsible for this.
5. Leatherback Turtle
The largest marine turtle and one of the largest living reptiles, the leatherback turtle, (Dermochelys coriaceathe) has survived for more than a hundred million years, but is now facing extinction. Recent estimates of numbers show that this species is declining, particularly in the Pacific where as few as 2,300 adult females now remain, making the Pacific leatherback the world's most endangered marine turtle population. Atlantic turtle populations are more stable but scientists predict a decline due to the large numbers of adults being caught as bycatch and killed accidentally by fishing fleets. Additionally, rising sea levels and higher temperatures on Atlantic beaches pose a new threat to turtles and their offspring.
6. Bluefin Tuna
The Atlantic bluefin tuna (Thunnus thynnus) is a large migratory fish found in the western and eastern Atlantic and the Mediterranean Sea. Bluefin tuna is the source of highest grade sushi. Bluefin tuna fisheries are near collapse and the species at serious risk of extinction if unsustainable fishing practices in the Eastern Atlantic and Mediterranean are not stopped.
7. Mountain Gorilla
Scientists consider mountain gorillas (Gorilla beringei beringei) to be a critically endangered gorilla subspecies, with about 720 surviving in the wild. More than 200 live in the Virunga National Park, located in the eastern part of the Democratic Republic of Congo, bordering Rwanda and Uganda. War has been waged in areas around the park, with gorillas subject to related threats such as poaching and loss of habitat.
8. Monarch Butterfly
Every year millions of delicate monarch butterflies (Danaus plexippus) migrate from North America to their winter habitat in Mexico. A well conserved and protected high-altitude pine and fir forest in Mexico is essential for the survival of the overwintering of monarchs, which has been recognized as an endangered biological phenomenon.
9. Javan Rhinoceros
Listed as Critically Endangered on the IUCN Red List (2009), the Javan rhino (Rhinoceros sondaicus) is considered to be one of the most endangered large mammals in the world with only two populations existing in the wild, for a total number of less than 60 animals. Highly prized as a commodity in traditional Asian medicine, Javan rhinos have also been brought to the verge of extinction by the conversion of forest habitat to farmland.
10. Giant Panda
An international symbol of conservation since WWF’s founding in 1961, the giant panda (Ailuropoda melanoleuca) which numbers around 1,600 in the wild, faces an uncertain future. Its forest habitat in the mountainous areas of southwest China has become fragmented, creating a number of small and isolated populations.
