A conservation effort called _____ is being successfully used in some parts of the world where the absence of certain species has upset the natural balance.
rewilding
As a gray wolf lets out a mournful cry into the sky, nearby wolves answer him with ______.
high-pitched howls.
In 1995, after more than a 70-year absence, ______ started roaming Yellowstone National Park once again.
gray wolves
Unlock this slideshow and over 4 million more with Baamboozle+