@BillW,
13 Types of animals you wouldn't try to ride.
1. African lion
2. Fieldmouse (unless you're Tom Waits)
3. Porcupine. Sticky ride.
4. Rhinoceros
5. Crocodile
6. Shark. The abrasive skin would be chafing. Plus, there's the breathing problem.
7. Hyena - nasty little creature with a humped back.
8. Grizzly Bear
9. T-Rex
10. Red kangaroo. Bumpy ride.
11. Lobsters.
12. Horny Toads
13. Gorilla. He might try to ride you instead.