Post by Deleted on Nov 15, 2013 14:11:12 GMT -5
American Black Bear
The American black bear (Ursus americanus) is a medium-sized bear native to North America. It is the continent's smallest and most widely distributed bear species. Black bears are omnivores with their diets varying greatly depending on season and location. They typically live in largely forested areas, but do leave forests in search of food. Sometimes they become attracted to human communities because of the immediate availability of food. The American black bear is the world's most common bear species.
Black bear weight tends to vary according to age, sex, health, and season. Seasonal variation in weight is very pronounced: in autumn, their pre-den weight tends to be 30% higher than in spring, when black bears emerge from their dens. Black bears on the East Coast tend to be heavier on average than those on the West Coast, although black bears follow Bergmann's rule and bears from the northwest are often slightly heavier than the bears from the southeast. Adult males typically weigh between 57–250 kg (126–550 lb), while females weigh 33% less at 41–170 kg (90–370 lb).
Asiatic Black Bear
On average, adult black bears are slightly smaller than American black bears, though large males can exceed the size of several other bear species.[20] They measure 70–100 cm (28–40 in) at the shoulder, and 120–195 cm (47–77 in) in length. The tail is 11 cm (4.4 inches) long. Mature males typically weigh between 100–200 kg (220-440 lbs), with an average weight of about 135 kg (about 300 lbs). Females weigh about 65–90 kg (143–198 lbs), with large ones up to 140 kg (308 lbs). The skulls of Asian black bears are relatively small, but massive, particularly in the lower jaw. Adult males have skulls measuring 311.7–328 mm (12.3–13 in) long and 199.5–228 mm (7.9–9 in) wide, while females have skulls measuring 291.6–315 mm (11.5–12.4 in) long and 163–173 mm (6.4–6.8 in) wide.
The American black bear (Ursus americanus) is a medium-sized bear native to North America. It is the continent's smallest and most widely distributed bear species. Black bears are omnivores with their diets varying greatly depending on season and location. They typically live in largely forested areas, but do leave forests in search of food. Sometimes they become attracted to human communities because of the immediate availability of food. The American black bear is the world's most common bear species.
Black bear weight tends to vary according to age, sex, health, and season. Seasonal variation in weight is very pronounced: in autumn, their pre-den weight tends to be 30% higher than in spring, when black bears emerge from their dens. Black bears on the East Coast tend to be heavier on average than those on the West Coast, although black bears follow Bergmann's rule and bears from the northwest are often slightly heavier than the bears from the southeast. Adult males typically weigh between 57–250 kg (126–550 lb), while females weigh 33% less at 41–170 kg (90–370 lb).
Asiatic Black Bear
On average, adult black bears are slightly smaller than American black bears, though large males can exceed the size of several other bear species.[20] They measure 70–100 cm (28–40 in) at the shoulder, and 120–195 cm (47–77 in) in length. The tail is 11 cm (4.4 inches) long. Mature males typically weigh between 100–200 kg (220-440 lbs), with an average weight of about 135 kg (about 300 lbs). Females weigh about 65–90 kg (143–198 lbs), with large ones up to 140 kg (308 lbs). The skulls of Asian black bears are relatively small, but massive, particularly in the lower jaw. Adult males have skulls measuring 311.7–328 mm (12.3–13 in) long and 199.5–228 mm (7.9–9 in) wide, while females have skulls measuring 291.6–315 mm (11.5–12.4 in) long and 163–173 mm (6.4–6.8 in) wide.
