This colour morph is due to a recessive allele common in the population. They are not albinos. Estimates say the spirit bear population is between 400-1000 individuals. Scientists have found that black bears are not as effective at catching fish as white bears, as the white bears are less visible from the perspective of the fish. While at night the two colors of bears have similar success rates at catching fish, such as salmon, during the day the white bears are 30% more effective.