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• The Mexican grizzly bear is capable of breaking the spine of a bull, bison, or bison with a single paw strike.
• 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.
• The smallest brown bears live in Europe, while the largest live in Alaska and Kamchatka, where they weigh 500 kg or more.
• 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.
• Adult male European brown bears reach a mass of 320–350 kg, occasionally larger. The maximum recorded mass is 481 kg.
• Females give birth during hibernation.
• The brown bear is one of the largest terrestrial predators.