Researchers identified over 100 species that have dropped by more than 50 percent in the last two decades: "This is a wake-up ...

Scientists have been searching for the species since it disappeared in 1933. Researchers have rediscovered a rare fish species presumed to be extinct after it was not seen for more than eight decades.

Are humans the only species to drive another to extinction? Tom Ruppel | Dixon, California Human activities are the most prominent cause of species extinction today, but not the only one.