2. Great Auk (Pinguinus impennis): This flightless bird was once found in the North Atlantic Ocean, but was hunted to extinction by the mid-19th century for its feathers and meat. The last known great auk was killed in 1844.
3. Dodo Bird (Raphus cucullatus): This flightless bird was native to Mauritius, an island in the Indian Ocean. It was hunted to extinction by the late 17th century for its meat and eggs. The last known dodo was killed in 1681.
4. Passenger Pigeon (Ectopistes migratorius): This bird was once the most abundant bird in North America, with flocks of over a billion individuals. However, it was hunted to extinction by the early 20th century for its meat and feathers. The last known passenger pigeon died in captivity in 1914.
5. Caribbean Monk Seal (Monachus tropicalis): This seal was once found in the Caribbean Sea, the Gulf of Mexico, and the Bahamas. It was hunted to extinction by the mid-20th century for its fur and meat. The last known Caribbean monk seal was killed in 1952.
6. Stellers Sea Cow (Hydrodamalis gigas): This giant marine mammal was once found in the North Pacific Ocean. It was hunted to extinction by the late 18th century for its meat, fur, and oil. The last known Steller's sea cow was killed in 1768.
7. Great Indian Rhinoceros (Rhinoceros unicornis): This rhinoceros was once found in India, Nepal, and Bhutan. It was hunted to extinction by the early 20th century for its horns, which were believed to have medicinal properties. The last known great Indian rhinoceros was killed in 1925.
8. Black Rhinoceros (Diceros bicornis): This rhinoceros was once found in Africa, but was hunted to extinction in the early 20th century for its horns, which were believed to have medicinal properties. The last known black rhinoceros was killed in 1936.
9. Northern White Rhinoceros (Ceratotherium simum cottoni): This rhinoceros was once found in Uganda and Sudan, but was hunted to extinction in the early 21st century for its horns, which were believed to have medicinal properties. The last known northern white rhinoceros died in 2018.
10. Baiji (Lipotes vexillifer): This freshwater dolphin was once found in the Yangtze River in China, but was hunted to extinction in the early 21st century for its meat and oil. The last known baiji was killed in 2002.
11. Spix's Macaw (Cyanopsitta spixii): This parrot was once found in Brazil, but was hunted to extinction in the early 21st century for its feathers, which were used to make hats and jewelry. The last known Spix's macaw died in captivity in 2018.
12. Philippine Eagle (Pithecophaga jefferyi): This bird of prey is found in the Philippines, where it is currently facing extinction. The Philippine eagle is threatened by habitat loss, hunting, and the illegal pet trade.