How Many Babies Survive to Grow Up? Polar Bears
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KidZone Creature Facts
The Polar Bear
Approximate worldwide winter
distribution of polar bears (light grey).
Polar bears are distributed throughout most
ice-covered seas of the Northern Hemisphere.
Source: http://www.polarbearsinternational.org/
Ursus maritimus
The polar behave or the ocean/water ice bear are the earth'southward largest country predators. They tin be found in the Artic, the U.Southward. (Alaska), Canada, Russian federation, Denmark (Greenland), and Norway. Each of these countries either banned hunting or established rules for how many polar bears could exist hunted within its ain boundaries. These rules help go along polar bear populations stable. Today, 25,000 to 40,000 polar bears roam the Chill.
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Effectually the historic period of four or five the female person polar acquit can get-go having babies. They usually only have two cubs and they have these babies in a cavern they've dug in a big snow drift. They stay there over winter and come up out in spring with the babies.
The babies are much smaller than human babies when they're born. They are the size of a rat and weigh niggling more than a pound. They can grow to full man size in a year if they have lots of food.
Pair of polar bear cubs.
photo by: US Fish and Wild fauna
Male polar bears may grow 10 feet tall and weigh over 1400 pounds. Females reach seven feet and counterbalance 650 pounds. In the wild polar bears alive up to age 25.
Despite what nosotros think, a polar bear's fur is not white. Each pilus is a articulate hollow tube. Polar bears wait white because each hollow hair reflects the calorie-free. On sunny days, it traps the sun's infrared heat and keeps the bear warm at 98 degrees F (when they're resting).
Polar acquit fur is oily and water repellent. The hairs don't mat when wet, allowing the polar bears to easily shake complimentary of water and whatsoever water ice that may form afterward pond.
Underneath the fur, a polar behave'southward skin is actually black -- the blackness peel soaks up the lord's day's rut and helps them stay warm.
Polar bears also have a 4 inch layer of fat underneath their skin. This prevents them from losing whatever of their heat. In fact, if you expect at a polar carry with an infared camera, they are pretty close to invisible (in other words, they don't requite off any estrus!)
The smallest foot pad is the front end track
and the larger is the hind rails.
Polar bears have wide front paws with slightly webbed toes that aid them swim. They paddle with their front feet and steer with their hind anxiety. Manus pads with rough surfaces help prevent polar bears from slipping up on the ice.
Polar bears take been known to swim 100 miles (161 kilometers) at a stretch.
Polar bears primarily eat seals. They often rest silently at a seal'due south breathing pigsty in the ice, waiting for a seal in the water to surface. Once the seal comes up, the behave will spring and sink its jagged teeth into the seal's head.
They accept a special liver that allows them to process all of the seal fat they swallow - seals store a lot of vitamin A in their blubber which allows them to survive and grow rapidly. A polar bear's liver contains x times more vitamin A than any other animal on globe - their liver has evolved to allow them to process and eat all of the seal blubber they need to stay alive.
Sometimes the polar bear stalks its prey. It may see a seal lying near its breathing hole and slowly move toward it, then charge it, bitter its caput or grabbing it with its massive claws. A polar acquit may also chase by swimming beneath the water ice.
Humans are the polar bears only predator. Infant polar bears often starve. In fact, 70 per centum do not live to their third altogether. Sometimes seals are hard to find, particularly in the summertime when the ice has melted. All across the Chill, human being is moving in to mine oil and coal and there is less space for the polar bear to live. Oil spills tin can be very dangerous. A bear with oil on its coat cannot regulate its trunk temperature properly. If the behave eats the oil while grooming it could dice.
Man made pollution is also a cause of death. At each phase of the food chain, pollutants get more concentrated. Past the end when the polar bear eats the seal and it could be lethal.
Polar Bears are considered marine mammals -- just like seals, whales and dolphins. Although polar bears are related to the chocolate-brown bear, they have evolved over time to live in common cold northern arctic climates. Their population is on the decline and they are considered a "vulnerable" species.
photograph by: US Fish and Wildlife
Protecting polar bears isn't just a matter of being nice. Their trunk is very dissimilar than virtually mammals -- they are able to process large amounts of fat (seal blubber) and are able to lose and gain large amounts of weight through the year without causing stress health problems. Scientists are studying them to see if they can provide a fundamental to man diseases similar diabetes and centre disease!
Scientific genus and species: Ursus maritimus
- Class: Mammalia (mammals)
- Society: Carnivora (carnivores)
- Family: Ursidae (bear family)
- Genus: Ursus
- Species: maritimus (meaning "sea bear")
Polar Acquit On-Line Jigsaw Puzzles:
(Puzzle i: Polar Bear)
(Puzzle 2: Polar Behave with cub)
(Puzzle 3: Seal)
Polar Bear circumvolve do craft
Polar Carry Poster/coloring folio
"Polar Bear, Polar Bear What Do You Hear?" book break
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How Many Babies Survive to Grow Up? Polar Bears
Source: https://www.kidzone.ws/sg/polarbear/polar_bear.htm
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