Initially, a male suitor trails his prospective mate from a distance, smelling her daybeds and sniffing her urine to analyze how receptive she is. The biggest bears in the population tend to be the most prolific breeders. Litter size ranges from one to six, depending on the species and the productivity of the surrounding habitat. Cubs weigh one-tenth as much as human babies and are born blind. Depending on food abundance, mothers especially grizzlies may keep their yearlings a second even a third year, denning together again and breaking up in the third or fourth year. Even though males are capable of breeding at three or four years of age, they rarely have the opportunity to do so because of intense competition from older, bigger males.
At first, she may run away, playing hard to get. Estrus females are frequently pursued by more than one male. Litter size ranges from one to six, depending on the species and the productivity of the surrounding habitat. The average breeding age for female black bears is 3. During spring when roaming males begin courting reproductive aged females, mothers are often forced to break up the family unit, in order to protect their cubs from infanticide. During mating, the male and female become almost inseparable, mating repeatedly in the ensuing days. Not only are male bears promiscuous, but females often have more than one mating partner. Stressed and frightened, they whine and whimper in disbelief. The cubs are completely distraught. Infanticide among bears is natural but rare. Breeding season begins in May and lasts until early July, with mating mainly occurring during June. If another male arrives during the courting ritual, the males may challenge one another for dominance or they may fight if they appear evenly matched. Sows, especially grizzlies, are very protective of their young and will fight back fiercely. Sub-adult males, on the other hand, are usually discouraged from staying and must travel often large distances to establish a home range. The biggest bears in the population tend to be the most prolific breeders. Males rarely retaliate, but bide their time. Mother bears tend to be affectionate, protective, devoted, strict, sensitive and attentive toward their cubs, raising them to an age where they can survive on their own. If the female does not attain sufficient body fat or weight during the summer and fall, the embryos will not attach to the uterine wall and subsequently develop into little bears. By comparison, a pair of white-tailed deer could produce more than 1, descendants in 10 years. Even though males are capable of breeding at three or four years of age, they rarely have the opportunity to do so because of intense competition from older, bigger males. Alone and vulnerable, siblings will often stay together for some time after their mother leaves them, eating and sleeping side-by-side, and even denning together. But in time she allows him closer and closer. Males reach sexual maturity at roughly the same age as their female counterparts. Copulation normally lasts 20 to 30 minutes, but may last up to one hour or more. In theory, a male and female black bear born this year — if they breed as soon as they reach sexual maturity and as often as possible, and if all their offspring survive to do the same — could in the space of ten years have grown to a population of 15 bears assuming none died. A male and female bear may spend days courting each other before mating. Cubs weigh one-tenth as much as human babies and are born blind.
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