Sentences with phrase «grave danger of extinction»

At Patuxent, we have been raising whooping crane chicks for 45 years; the species had reached a low of about 16 adult birds by the late 1930s and was in grave danger of extinction, as they still are today.

After World War II, the Birman was in grave danger of extinction, as only one known pair of Birmans had survived the German occupation.

CONSERVATION AND CLONING • Although we may soon have the biotechnology tools necessary to revive long - extinct species, such as woolly mammoths, we should focus more on efforts to save the 20,000 species now in grave danger of extinction, the Editors state in this month's Science Agenda.