What a Wolf's Howl Says

Living on Earth
When a wolf howls in Yellowstone’s snowy landscape, a howling chorus responds. But in the spring, the wolves grow quieter as they raise pups. Now researchers understand how wolf calls change with the seasons, and hope to answer the tougher question of what the howls actually mean. The park’s reporter-in-residence, Jennifer Jerrett, has the story. (published February 19, 2016)