Is it true that a bear's sense of smell is 7 times greater than that of a bloodhound?
Indeed it is. There is perhaps no other animal with a keener sense of smell. Bears rely on their sense of smell to locate mates, detect and avoid danger in the form of other bears and humans, identify cubs, and FIND FOOD. Although the region of the brain devoted to the sense of smell is average in size, the area of nasal mucous membrane in a bear's head is one hundred times larger than in a human's. This gives a bear a sense of smell that is 7 times greater than a bloodhound's. In addition, they have an organ called a Jacobson's organ, in the roof of the mouth, that further enhances their sense of smell.
Here are some accounts of how truly well a bear can smell:
"A black bear in California was once seen to travel upwind three miles in a straight line to
reach the carcass of a dead deer."
". . . male polar bears march in a straight line, over the tops of pressure ridges of uplifted ice . . .
up to 40 miles to reach a prey animal they have detected."
"A bear has been known to detect a human scent more than fourteen hours after the person passed along the trail."
"A male can detect which way a breeding female is traveling just by sniffing her tracks."