In today's Entertainment section of the SF paper:
http://www.sfgate.com/cgi-bin/article.cgi?f=/n/a/2010/07/27/entertainment/e052330D96.DTL&type=entertainment
Jack Hanna wards off grizzly with pepper spray
Associated Press July 27, 2010 04:52 PM
(07-27) 16:52 PDT Columbus, Ohio (AP) --
TV host and zookeeper Jack Hanna says he took his own advice and used pepper spray on a grizzly bear headed toward him.
The Columbus Zoo keeper and frequent David Letterman guest said he was with his wife and other hikers in Montana's Glacier National Park on Saturday when a bear cub, weighing about 125 pounds, charged them. Hanna told The Columbus Dispatch that he held up a canister of pepper spray, which he takes routinely on hikes.
... Hanna had recently filmed a message for the National Park Service encouraging hikers to carry pepper spray.