Kodiak bear
An average adult male measures in length, and stands tall at the shoulder. The largest recorded wild male weighed , and had a hind foot measurement of . A large male Kodiak bear stands up to tall at the shoulder, when it is standing on all four legs. When standing fully upright on its hind legs, a large male could reach a height of . The largest verified size for a captive Kodiak bear was for a specimen that lived at the Dakota Zoo in Bismarck, North Dakota. Nicknamed "Clyde," he weighed when he died in June 1987 at the age of 22. According to zoo director Terry Lincoln, Clyde probably weighed close to a year earlier. He still had a fat layer of when he died.
Brown bear
In the roughly 0.9 million years of its existence, brown bears have had to contend with multiple competing species, a majority of which went extinct at the end of the Pleistocene Era. In its much longer history in Eurasia, brown bears diverged from the two species of cave bear, the giant ("U. spelaeus") and small cave bears ("U. rossicus"), two species that it existed alongside in what is now Europe for the larger species and Central Asia and Siberia for the smaller species. The cave bears were similar in size to the larger forms of brown bear and polar bear alive today in terms of length, but were bulkier, with much higher-density skeletal remains and presumably rather heavier than the modern brown bear, with the giant cave bear about the same length as a modern Kodiak bear but projected to be some 30% heavier. Pleistocene-era brown bears appear to have been somewhat larger and more carnivorous than most modern forms based on skull dimensions. The cave bears are usually deemed to have been highly herbivorous to a greater extent than the brown bear, based on examinations of stable isotopes and dental morphology. Recent studies, however, have shown that cave bears could have opportunistically adapted to a fairly omnivorous diet and consumed many herbivore carcasses. Despite this, the dietary differences and differing habitat preferences (caves, of course, being much more habitually used by the cave bear rather than by the brown bear) allowed the three "Ursus" to persist at the same time in different parts of Eurasia.