A gray wolf's howls can be heard over 10 square miles! Learn more amazing facts about the gray wolf in this video from National Geographic Kids. ➡ Subscribe for more National Geographic Kids videos: http://bit.ly/SubscribeToNatGeoKids ➡ Watch the full series here: http://bit.ly/NGKAmazingAnimals About Amazing Animals: Learn the most unique and interesting facts about animals from all over the world with this video series by National Geographic Kids. More National Geographic Kids: Check o