Add Yahoo as a preferred source to see more of our stories on Google. FILE: Wolf 1229 howling in Yellowstone National Park, which includes parts of Wyoming, Montana and Idaho. (Scott Wolff/Cry Wolf ...

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.

While exploring the forest, I came across a pack of wolves moving quietly among the trees. At first, they were cautious—but soon one started to howl and the others joined in. Watching these wild ...