The document discusses several animal species that have gone extinct, including the Quagga, Tasmanian Wolf, English Wolf, Turanian Tiger, Steller's Sea Cow, Spectacled Cormorant, Passenger Pigeon, Golden Toad, Caribbean Monk Seal, Pyrenean Ibex, Phororhacos, Spix's Macaw, Bubal Hartebeest, Javan Tiger, Tecopa Pupfish, and Baiji River Dolphin. It provides brief details about each species and the causes and timing of their extinction.