Question: what are the main extinct species?
Answer: Sabre-toothed Cat. Often called Sabre-toothed Tigers or Sabre-toothed Lions, they existed 55 million to 11,700 years ago.
Woolly Mammoth. An enormous mammal, believed to be closely related to the modern-day elephant. ... 
Dodo. ... 
Great Auk. ... 
Stellers Sea Cow. ... 
Tasmanian Tiger. ... 
Passenger Pigeon. ... 
Pyrenean Ibex. ...