A bear's nose picks up 100 times our scent.
There is a documentary on the negotiation of space between animals and humans, especially in regard to housing developments and land useage. Park rangers state that it is easier to train one bear than 1,000 humans.
I've spoken to people who smelled the strong smell of bear in the outback, but have never smelled it myself. Meanwhile, in summer heat bears come down to soak in Los Angeles foothill jacuzzis.
photo: Wildpark Bad Mergentheim