The Tasmanian Tiger

The tasmanian tiger was already extinct on the australian mainland well before the british arrived. The arrival of the dingo increased competition for survival amid the thylocenes on the mainland. This problem is compounded when europeans arrive and they bring their dogs with them. Zoos around the world started calling for captive specimens, not so much to display them, but in the zoo's defence. They were hoping to get breeding pairs. And they were honestly trying to save the species. All of these attempts, every single one - they were all unsuccessful. Not the last thylasen outside of australia died at the london zoo in 31ene years