الدب الأشيب

• The Mexican grizzly bear is capable of breaking the spine of a bull, bison, or bison with a single paw strike.
• The brown bear migrated from Asia to North America 50–100 thousand years ago, but until the end of the Wisconsin glaciation, it lived only in Alaska. The short-faced bear, occupying the same ecological niche, hindered its further expansion south and east across the continent.
• Despite its clumsy appearance, the Mexican grizzly bear can run at speeds up to 50 km/h. It is also a good swimmer and climbs trees well in its youth.
• During the 10–30 day mating season from May to July, male brown bears begin to roar loudly and fight each other for a female. The winner sometimes eats the defeated one.
• Coastal grizzlies are larger and stronger than forest ones; for example, in Katmai National Park, their average weight exceeds 450 kg, whereas in Yellowstone, the largest known individual weighed 408 kg.
• The lifespan of the Mexican grizzly bear in the wild is 20–30 years, and in captivity it can reach up to 47–50 years.
• The Mexican grizzly bear accumulates up to 180 kg of subcutaneous fat by winter and enters its den in autumn. Dens are usually located on dry ground, under the protection of fallen trees or uprooted tree roots.
• During hibernation, the Mexican grizzly bear loses up to 80 kg of fat. Contrary to common belief, its winter sleep is not deep, and its body temperature fluctuates between 29 and 34 degrees.
• Females give birth during hibernation.
• The brown bear is one of the largest terrestrial predators.