The group of now extinct humans known as Neanderthals did not leave clear evidence of being musical.

VOA: special.2009.08.18

Some of them get reinforced and those are the ones that survive and others don't get reinforced and those are the ones that go extinct.

一些行为得到了强化，因而保存了下来,另一些行为则并未得到强化,不再出现。

耶鲁公开课 - 心理学导论课程节选

"A citizen scientist outside Peoria actually sent in a photograph of a species of bumblebee, the rusty patched bumblebee,bombus affinis, that was thought to have gone extinct in that area, and was recovered by a private citizen with a digital camera."

VOA: special.2011.05.24

Environmental activists say plans by Laos to build a dam in the Don Sahong area near the Cambodian border could doom the nearly extinct Irrawaddy dolphin.

VOA: standard.2010.01.11

Atlantic bluefin tuna is being overfished and there are fears it could become extinct.

VOA: standard.2010.03.04

He builds guitars from Appalachian spruce and nearly-extinct Brazilian Rosewood.

VOA: standard.2010.07.06

The hope of all those who took part in both the DNA tests and the funeral procession is that a databank will be created of the real Venetian, who risks becoming extinct.

VOA: standard.2009.11.14