It is not yet known why and when they went extinct.
With the death of David in 1839, the main male line went extinct.
Species are now being described just before or even after they have already gone extinct.
The species is thought to have gone extinct around the 16th century.
It went extinct in the beginning of the ice age.
So we can't feel sorry for a species going extinct?
"And they have gone extinct since 1989, when I started working here."
It went extinct around the turn of the 20th century.
It is believed to have gone extinct within the last 500 years.
Most of these went extinct by 5 to 10,000 years ago.