1. Elk are the most _______________ of the seven native ungulate species in Yellowstone, with an estimated population of 10,000 to 20,000 animals.

2. Yellowstone's thermal features keep its waters from freezing over, allowing otters year-round ___________.

3. Male bison can stand over six feet tall and weigh up to one ton, making bison the largest land mammal in North America. Despite their size, bison are __________ and can run over 30 miles per hour

4. In summer months, male elk (known as bulls) are easily distinguished by their ___________, which they drop and regrow each year.

5. Perhaps no animal is more iconic to Yellowstone than the gray wolf. Each of Yellowstone's wolf packs consists of around 10 wolves. These social animals know how to _______________ with other members of their own pack and to indicate their territory to rival packs.

6. Pack members work together to hunt large __________.

7. Otters have two young per litter. Females act as the _______ parent and enjoy playing with their young in and around the water.

8. Playtime also helps otters learn ___________ skills.

9. Otters propel themselves through the water with powerful tails and flexible bodies, ___________ them to catch fish like native Yellowstone trout.