There have been conflicting reports whether the language has become extinct.

Most are considered endangered, and many have recently become extinct.

It became extinct ca. 1950, although some people remember a few words.

More important, they found that none of the original species in either river had become extinct.

It must surely have become extinct by 2.5 million years ago.

But he's working at a time when that species has become nearly extinct.

Many species have become extinct, and more than 1000 are endangered.

At the same time, some 200 native species have become extinct.

It may have become extinct there about 9000 years ago.

Their language and people are in the most danger of becoming extinct.