Grizzilies stand the greatest chance of all. They are omnivorous. One of the strongest and fastest. Bear posesses tremendous power: a large specimen can break a bison's spine with one blow of its powerful forepaw. In spite of their size, some have been clocked at speeds in excess of 35 miles per hour. Aside from their overwhelming strength and deceptive speed, Brown Bears are legendary for their physical stamina. They are capable of running at full speed for miles and miles at a time without stopping. What's more, they are primarily nocturnal. Watch out for this big guy! I am changing my bet from the tiger to the grizzly.