For most of the year, black bears are solitary creatures, except from June through July when mating takes place. The cubs are born in their dens following a gestation period of about seven months. The cubs are born blind and nearly hairless, weighing in under a pound. One to four cubs may be born, but two is most common. Cubs remain with their mothers through the first winter following birth.
bears mature sexually at 3 to 6 years of age, depending
upon their environment. In the more southern parts of
their range, bears will breed every other year; however,
if a litter is lost early during the first summer, the sow
will breed again that year. In more marginal environments
such as northern Alaska, black bears keep their cubs with
them an extra year and will breed every third year.