A screenshot of a Chinese paddlefish specimen from a CCTV video.

Another flagship species of the Yangze River, the baiji (or Chinese river dolphin), is listed as "critically endangered" by the IUCN. However, the last known living baiji died in 2002, and none has been seen ever since.

This is a dugong, the sole living relative of the extinct Steller's sea cow. The latter went extinct in 1768, only 27 years after its discovery.

The northern white rhino is a subspecies doomed to be extinct. The only known male died in 2018, leaving two females left, both infertile. In fact, all five species of rhinos are on the brink of extinction, especially the three in Asia.

You may have seen the Père David's deer, or Milu deer, in the zoo. The fact is they are extinct in the wild, so are the Hawaiian crow, the Socorro dove, and the Spix's macaw.

The Scimitar-horned oryx. This beautiful animal is extinct in the wild too.

The golden toad was once abundant in a small, high-altitude region of about four square kilometers in an area in Costa Rica, and was commonly considered the "poster child" for the amphibian decline crisis. The last sighting of a single male golden toad was in 1989.

The passenger pigeon was once the most abundant bird in North America, numbering around three billion, and possibly up to five billion at the time of the discovery of America. They were hunted by Native Americans, but hunting intensified after the arrival of Europeans, particularly in the 19th century. The last passenger pigeon, Martha, died in 1914.

Living in the waters of the North Atlantic, the great auk was once an important part of many Native American cultures, both as a food source and as a symbolic item. Early European explorers to the Americas used the great auk as a convenient food source or as fishing bait, reducing its numbers. The bird's down was in high demand in Europe too. The last two known to be alive were killed in 1844.

The ivory-billed woodpecker was one of the largest woodpeckers in the world. Though it is classified as "critically endangered" now, the last sighting of the species was in 1944. The American Birding Association lists the ivory-billed woodpecker as "definitely or probably extinct."

The Eskimo curlew was one of the most numerous shorebirds in the tundra of western Arctic Canada and Alaska, with about two million birds killed per year in the late 1800s. As there has not been a confirmed sighting since 1963, the Eskimo curlew is now considered possibly extinct.

The thylacine, or Tasmanian tiger, was one of the largest known carnivorous marsupials, native to Tasmania, New Guinea, and the Australian mainland. The last known live thylacine was captured in 1933 and died in 1936. Intensive hunting encouraged by bounties is generally blamed for its extinction. Other contributing factors may have been disease, the introduction of dogs, and human encroachment into its habitat.

The Japanese sea lion was an aquatic mammal thought to have been extinct since the 1970s. They inhabited the Sea of Japan, especially around the coastal areas of the Japanese Archipelago and the Korean Peninsula. They were hunted commercially from the 1900s, leading to their extinction.