Grizzly bears can bring down prey, such as bison or moose, that outweigh the bear by several hundred kilograms and can steal kills from entire packs of wolves. Their top speed running on all fours has been reported to be around . Fergus, Charles. Wild Guide: Bears pp. 1-2Whitman, David. "The Return of the Grizzly" pp. 26, 28 By comparison, Usain Bolt ran at a record-breaking speed of at the 2008 Summer Olympics."Usain Bolt 100m 10 meter Splits and Speed Endurance" by Jimson Lee, dated August 22, 2008 Retrieved on July 1, 2009. Most people are incapable of reaching speeds even remotely close to this number; thus, it is impossible for a human to outrun a bear, even one not running at its highest possible speed.
