extinct

“It’s just like those open-world video games we play. Except this one is a place where extinct animals roam and where people party. Like, for real.”

“Or else both will go extinct, like the dodos?”

The children politely explained that they had slept perfectly well, but that their species was in the midst of going extinct and would soon be no more.

Dodos, as you know, are extinct; therefore, this rather gloomy phrase means that the thing being described is not merely dead.

Vulnerable, and at risk of becoming extinct in the wild.