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.

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A litter of weeks-old red wolf pups learned to howl together and it was all captured on video. The Great Plains Zoo in Sioux Falls, South Dakota, welcomed six red wolf pups on May 4. The litter ...