The passenger pigeon was once one of the most abundant birds on Earth, with an estimated population of up to 5 billion individuals. However, due to habitat loss and overhunting, the species was driven to extinction in the wild by the early 20th century. The last known passenger pigeon died in captivity in 1914.
Dodo (Raphus cucullatus)
The dodo was a flightless bird that was endemic to the island of Mauritius. It was a large bird, weighing up to 50 pounds, and it had a distinctive appearance, with a large head, a long beak, and short wings. The dodo was hunted to extinction by humans in the 17th century.
Great Auk (Pinguinus impennis)
The great auk was a flightless bird that was found in the North Atlantic Ocean. It was a large bird, standing up to 3 feet tall, and it had a distinctive black and white plumage. The great auk was hunted to extinction by humans in the 19th century.
Tasmanian Tiger (Thylacinus cynocephalus)
The Tasmanian tiger was a marsupial that was endemic to the island of Tasmania. It was a large carnivore, with a distinctive striped pattern on its fur. The Tasmanian tiger was hunted to extinction by humans in the 20th century.
Baiji (Lipotes vexillifer)
The baiji was a freshwater dolphin that was found in the Yangtze River in China. It was a large dolphin, growing up to 8 feet long, and it had a distinctive white body and a long, pointed snout. The baiji was declared functionally extinct in 2006, and it is believed to have been driven to extinction by habitat loss, pollution, and overfishing.