Related Clues:
- Brown or black animal
- Yogi, for one
- Scavenger at Yellowstone
- Yellowstone denizen
- Really tough test, informally
- Killer of an exam
- With 27-Across, it collapsed in 2008
- Really tough task
- Polar _____
- California flag animal
- Nasty exam
- Massive mammal
- One who's out of stock?
- California flag beast
- Winnie the Pooh, for one