Polar Bears, Sea Otters, and Manatees

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Polar Bears, Sea Otters, and Manatees. By Sam Wiernusz. Polarbearus Samus. Polar Bears ( Ursus maritimus ). Polar bear habitat. Largest bears on earth, with boars weighing 700-1500lbs Sows are half that size Live in the Arctic Circle. Polar bear diet. - PowerPoint PPT Presentation

Transcript of Polar Bears, Sea Otters, and Manatees

Polar Bears, Sea Otters, and Manatees

Polar Bears, Sea Otters, and ManateesBy Sam WiernuszPolarbearus Samus

Polar Bears (Ursus maritimus)

Polar bear habitatLargest bears on earth, with boars weighing 700-1500lbsSows are half that sizeLive in the Arctic Circle

Polar bear diet Polar bears are carnivorous. Their main diet is seals, which they hunt from the edge of the sea ice, mainly near the seals breathing holes which they locate by scent. When the ice melts and it is harder for them to find food they live off of stored fat reserves.(Nature is not always pretty!)

Polar bear diet Although they prefer seals, when food is scarce they will scavenge with their immense sense of smell or will attempt to eat walruses and beluga whales, although it is difficult to subdue them. They are also known to eat muskox, reindeer, birds, eggs, rodents, shellfish, crabs, and other polar bears. They have been known to eat some vegetation, although it has really no beneficial factors.

Polar bears Mating habits Polar bears are polygynous. They meet mates at a good feeding ground in April and May, where males will fight for mating rights and get a mate. The pair will mate for 1 week. They fertilized eggs are suspended and the female eats up to half her body weight to prepare for giving birth.

*Polar bears do not hibernate, they are active all year, except pregnant females who will go into a dormant state while pregnant.Polar bears mating habits The female will dig a maternity den in snow drifts or permafrost in the fall and then go into dormancy. She will give birth to blind cubs between November and February. When they leave the den the cubs will weigh about 33lbs. At 2 years of age they cubs are weaned and sent off on their own.

Polar bear fun factsPolar bears live up to 25 yearsThey can swim! On average their swims are about 96 miles, however they can swim up to 220 miles!There are only about 20,000-25,000 left in the wildStatus-threatenedPolar bear threatsSport huntingGlobal warming

Seaotterous samus

Sea Otters (Enhydra lutris)

Sea Otter HabitatSea otters live in Pacific Ocean, off the coasts of North America and Asia.

Sea otterThey have webbed feet, waterproof fur and nostrils and ears that close when they go in the water. They spend most of their time in the water, and sleep on their backs in the water usually, but will sometimes come up on land to sleep or rest.

Sea otterThey grow to about 4 feet long and about 65 pounds, and can live to be 23 years old. They float on their backs anchored by seaweed.

Sea otter dietSea otters eat sea urchins, mussels, crabs, clams, snails and many other marine species. They eat up to 25% of their body weight daily.

Sea otter mating habitsSea otters mate throughout the year, and have a gestation period of 6-8 months. They generally give birth to one pup but can give birth to twins, and they do it in the water!

Sea otter factsOnly known mammal besides primates, birds and a few other species to use tools.Heaviest members of the weasel familyDo not have blubber, they use dense fur to keep warmAbout 100,000 left in the wildSecond smallest marine mammalMeticulously clean themselvesStatus-threatened

Manateeus samus

Manatees (A.K.A. the sea cow)

Manatees rangeThere are three species of manatee, distinguished by where they live. They are the Amazonian manatee (Trichechus inunguis), the West Indian manatee (Trichechus manatus), and the West African manatee (Trichechus senegalensis).

Manatee habitatManatees live in shallow coastal waters and rivers. They use they front fins to drag themselves through shallow water and dense vegetation.

Manatee dietManatees are nicknamed the sea cow because they are herbivorous and mostly just spend their time grazing on underwater vegetation. They can be 13 feet long and weigh up to 1,300 pounds and can eat 1/10 of their body weight a day. (So if the sea cow weighs 1300lbs, it eats about 130lbs of plants a day)

Manatee mating habitsManatees mate once every 2 years and produce only 1 offspring after a 12 month gestation period. The newborn calf is pushed up to the surface to breath by its mother for about the first hour of its life. It is weaned at about 12-18 months.

Manatee factsCan live up to 40 years in the wildStatus-endangeredUsually not very social, but can be in groups of 6 or lessDue to their curious nature, boat propellers kill many of themSmart-can be comparable to a dolphin or porpoiseCannot live in waters under 60 degrees Fahrenheit

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