Common characteristics of modern bears include large bodies with stocky legs, long snouts, shaggy hair, plantigrade paws with five nonretractile claws, and short tails. While the polar bear is mostly carnivorous and the giant panda feeds almost entirely on bamboo, the remaining six species are omnivorous, with varied diets.
With the exceptions of courting individuals and mothers with their young, bears are typically solitary animals. They are generally diurnal, but may be active during the night (nocturnal) or twilight (crepuscular), particularly around humans. Bears are aided by an excellent sense of smell, and despite their heavy build and awkward gait, they can run quickly and are adept climbers and swimmers. In autumn, some bear species forage large amounts of fermented fruits, which affects their behaviour. Bears use shelters, such as caves and burrows, as their dens; most species occupy their dens during the winter for a long period of sleep similar to hibernation.
Kurile Lake (Russian: Кури́льское о́зеро"Kuril’skoye Ozero", aka "Keuay") is a large caldera containing a crater lake located at the southern tip of Kamchatka Peninsula, within the Southern Kamchatka Wildlife Refuge in Russia.
It has an area of 77 square kilometres (30 sq mi) (the third largest by area of all lakes in Kamchatka and the second among the freshwater lakes, second only to Kronotsky lake). The lake has an average depth of 176 metres (577 ft), and a maximum depth of 306 m (1,004 ft). The lake is fed by snowmelt, rain and a few rivers and streams: the Etimynk, Hakytsin, Vychenkiya and Kirushutk. From the lake flows the Ozernaya (Lake) river into the Sea of Okhotsk to the west. The magnitude of fluctuation in the water level is one to three meters (the highest levels are from May to June and the lowest in April). The average water temperature off the shore is between six and seven degrees Celsius in September.
In the north-east coast is the dormant volcano Ilinskaya (Elijah). There are a few islands in the lake, the largest of which, Samang, is 0.66 km². Other islands include Chayachy, Serdtse (Heart), Nizkii (Low), and Glinyanii (Clay). There are hot mineral springs in the area.