Huge and cantankerous
Moose are the largest members of the deer family and one of the largest mammals in Yellowstone. A moose would make a hearty meal for a pack of wolves – if they can take it down. Moose have formidable defenses, so healthy adults are rarely killed. Predators have more luck with sick or old moose, or calves.
Moose may look awkward but their long legs are well-suited to run fast, wade and swim in water, and move through deep snow. Male moose grow huge antlers each year. A flap of skin known as a "bell" dangles under the neck and has no known function.