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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 largest brown bear caught on Kodiak Island for the Berlin Zoo weighed 1134 kg. This is the highest recorded weight among known individuals of this species.
• The smallest brown bears live in Europe, while the largest live in Alaska and Kamchatka, where they weigh 500 kg or more.
• Brown bears living on Kamchatka feed exclusively on capelin and salmon in the fall, and continue to eat only fish in the winter.
• 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.