I would say about 40000 years ago
Giant kangaroos are believed to have become extinct anywhere from 15,000 years ago to around 45,000 years ago.
Millions of years ago .
The rock wren is still extant, not extinct.
Dinosaurs.
They were indians who lived a long time ago. They became extinct a long time ago too.
Because they are extinct a long time ago.
Plants.
People still believe that there might still be a giant shark out there. But the megalodon was a shark everyone hopes is extinct!, I know I do haha :P
dodo bird
because they got extinct a long time ago
No it is an adjective, extinction is the noun. Dinosaurs are extinct. The extinction of dinosaurs happened a long time ago.
There was once a giant kangaroo, now known as the Procoptodon. It was one of the many species known as Australian megafauna, and became extinct thousands of years ago. The giant kangaroo no longer exists.