In addition to being streamlined for swimming, this also makes it easier for them to put their heads into ice holes or seal lairs looking for prey.įeast-and-famine metabolism. Compared to the rest of their bodies, polar bears have long necks and snouts with small heads. Predators whose prey is dangerous develop a more square snout, but seals are not dangerous. Their claws are also curved and sharp for catching and holding prey. There is a large gap between the front row and the molars in the rear, which are pointed for shearing flesh. The jaw and teeth have several traits typical of carnivores, but reveal their omnivorous origins. While they can grind vegetation, they are less suited to that than brown bear teeth are, They have long, sharp canines and a row of incisors across the front for grasping prey. Polar bears’ dentition reflects their diet as well as their history. The ability to use different specialized tactics means a polar bear can survive in various Arctic conditions. They can target a seal from a distance, then walk or swim towards it, undetected, until they’re close enough to charge at other times, they simply sit in wait at a seal’s breathing hole, waiting for the meal to appear and during seal pupping season in spring, polar bears target seal birth lairs. Andrew Derocher in his new book, Polar Bears, A Complete Guide to Their Biology and Behavior. They have several hunting methods, as explained by Dr. Polar bears are smart and sneaky hunters. According to Arkive, they can smell prey that is almost a kilometer away and up to a meter under the compacted snow. Polar bears can’t always rely on sight – ringed seals sometimes stay in lairs underneath the snow – so polar bears have a large olfactory bulb (the part of the brain related to smell) and a very keen nose. When food sources are scarce, as in the Arctic, being able to detect food from a distance is critical. ©Shaun MacGillivray/MacGillivray Freeman Films The polar bear is keenly adapted to this habitat, with a sharp nose, stealthy stalking ability, sharp teeth, small head, a long neck and jaw, and a physiology suited for infrequent but large meals. Out on the ice, a polar bear has several methods for finding and catching seals. When trapped on land during the ice-free season, polar bears may forage for plants but can only subsist this way temporarily. A polar bear’s habitat however, is largely devoid of vegetation. Although brown bears – especially grizzlies – are capable of hunting large animals, most of their diet is plant matter such as nuts and berries, or smaller animals like salmon. Their closest relatives, the brown bears (which aren’t as closely related as previously thought), are omnivores. This fat is the most energy-rich food source available, so with it, a polar bear gets the most bang for its buck. When food is plentiful, a polar bear won’t consume the whole seal, eating the blubber alone and moving on for another kill. Polar bears stalk seals on the ice, often laying in wait at breathing holes. Ringed seal blubber is their favorite food. Polar bears are almost purely carnivorous, and survive by hunting seals. This is the third in a five-part series about the polar bear’s adaptations to the Arctic environment. A sharp sense of smell and sharp teeth help polar bears to be master hunters in the icy Arctic.
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