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[102] [61] Male bears play no role in raising young. Infanticide, where an adult male kills the cubs of another, has been recorded in polar bears, brown bears and American black bears but not in other species. [104] Males kill young to bring the female into estrus. [105] Cubs may flee and the mother defends them even at the cost of her life.
The North American Bear Center, located in Ely, Minnesota, is home to the world's largest captive male and female American black bears. Ted, the male, weighed 431–453.5 kg (950–1,000 lb) in the fall of 2006. [63] Honey, the female, weighed 219.6 kg (484 lb) in the fall of 2007. [64]
There is also post-copulatory male-male competition that has been documented in species within the genus Ursus. The presence of dual paternity within a litter implies that sperm competition may take place after copulation. [11] [14] Another male strategy observed by male bears is sexually selected infanticide. [13]
Video footage from the incident, caught on the live webcams, shows bear number 469, an adult male bear estimated to be 30 years old, attack bear number 402, who is an older adult female while the ...
While male bears potentially live longer in captivity, female grizzly bears have a greater annual survival rate than males within wild populations, per a study done in the Greater Yellowstone Ecosystem. [138] Annual mortality for bears of any age is estimated at 10% in most protected areas. [56]
Pipaluk, a male polar bear, was the first male polar bear born in captivity in Britain, and, like Brumas, became a major celebrity at Regent's Park Zoo in London during early 1968. His name came from an Inuit term meaning "little one". Pipaluk was moved from London to Poland in 1985 when the Mappin Terraces, which housed the bears, was closed.
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An average adult male measures 244 cm (8 ft 0 in) in length, and stands 133 cm (4 ft 4 in) tall at the shoulder. The largest recorded wild male weighed 751 kg (1,656 lb), and had a hind foot measurement of 46 cm (18 in). [12] A large male Kodiak bear stands up to 1.5 m (4.9 ft) tall at the shoulder when it is standing on all four legs.