The document summarizes several animals that are now extinct, including the Tasmanian tiger-wolf, Dodo bird, Passenger pigeon, Quagga, Carolina Parakeet, Bubal Hartebeest. It notes that the Tasmanian tiger-wolf went extinct in 1936 due to human activities. The Dodo bird became extinct by the late 17th century due to hunting, habitat loss and competition from introduced animals. Billions of Passenger pigeons existed in North America but unregulated hunting and habitat loss caused their extinction. The last Quagga died in captivity in 1883 after being hunted for its meat and hides. The Carolina Parakeet disappeared in the early 20th century due