This time of year, the sound of a wolf howl piercing the night can really send shivers up your spine. But that call of the wild isn’t meant to scare you; it’s actually a message to other wolves.

Howling is loudest when a close companion is taken away, study shows. Sept. 1, 2013— -- The most ferocious predator in the forest, despised by cattle ranchers and feared by humans and nearly ...