"A big revelation to me was how reluctant black bear mothers are to defend their cubs against people, even when the family is cornered in a den and I'm trying to stick the mother with a needle to tranquilize her. Defense of cubs is more a grizzly bear trait. There is no record of anyone being killed by a mother black bear defending her cubs, and attacks are very rare. We routinely capture black bear cubs in the presence of mothers and have never been attacked. "

http://www.bear.org/website/bear-pages/b...lack-bears.html