Polar bear

• Polar bears and brown bears can produce a hybrid offspring • Polar bears evolved from brown bears • The timing of when polar bears first appeared is vital because it determines when they have experienced warm periods with little sea ice historically • Mitochondrial DNA (mtDNA) – relationships based on differences in a group of genes • The polar bear genome discovered alterations in genes related to the development of the heart, cardiovascular function and lipid metabolism – this is why…

people think polar bears and black bears are the same but that is not true. Polar bears and black bears have many differences and some similarities. A polar bears weight is about 330 to 1500 pounds and a black bear can weigh 90 to 600 pounds. Their height is also different, a polar bear can be from 7 to 8.4 feet and a black bear can be 5 to 6 feet. Polar bears are found in circumpolar north in areas where they hunt their prey and black bears live in North America in the forest. Polar bears are…

Most of the bears live in the poles including the polar bears, the main species of my paper. Most of north lands are covered by ice and snow which restraints behavior of animals at some extent. Also, the white color of the polar bears can be helpful to hide from predator. The polar bears (Ursus maritimus) eat mainly ringed and bearded seals located on the border of the Canadian arctic. Those seals are killed by polar bears during breathing holes depending on the availability of seals in the…

The polar bear is an animal that you can find in the bitter Arctic region. The Arctic is located at the northernmost part of the Earth. The Arctic is basically covered in water and most is frozen. Some features that can be found in the water are icebergs and glaciers that are made of frozen freshwater. A fact about glaciers and icebergs is that they make up 20% of Earth’s supply of freshwater. Most of all the Arctic ocean is made of sea ice which is frozen seawater that often is covered with a…

Polar Bears vs. Oil Drilling According to National Geographic in 2008, “The Endangered Species Act" has listed polar bears as threatened everywhere in the world they occur. Polar bears can only survive in areas where the oceans freeze" (National Geographic 2008). This decrease in population is a result of oil drilling in the arctic. The negative effects of oil drilling have spread to habitat loss, consumption of health declining chemicals, and impacts on polar bear family life/ birth rates.…

Sea Levels Rising Hurting Our Animals Polar bears are on the threatened species list because of global warming and sea levels rising. Millions of species aquatic and land animals are dying. Most under the sea ecosystems are severely affected by global warming which causes sea levels rising. For example, mangrove ecosystems require constant sea levels to survive. Sea levels are rising and affecting polar bears, sea turtles, and coral reefs. Polar bears are in jeopardy, becoming extinct…

to 100 pounds . They can be 8 inches and 3 feet wide . They are over 200 species of these kind of fish . The Polar Bear has extreme weather life to . The bears need the cold weather they not like the heat . These bears need to eat seals because the seals skin makes the bear have energy . When its hot the bears lay down to cool off . They can lay down for 20 hours or more . A male bear can reach to 8-10 feet high . Its weight can reach to 550 1700 lbs in kg its 250 or 771 .…

Polar bears Each fall, hundreds of polar bears migrate past this chilly hamlet, waiting for Hudson Bay to freeze over so they can venture onto the sea ice to pounce on unsuspecting seals. In the summer, instead of disappearing into carpets of wildflowers that blanket the tundra, polar bears were pawing through town dumps and wandering near the airport runway and snoozing on front porches. Those that survive the summer are at their most ravenous--and dangerous state. Starving bears often lose…

ulperines. A few examples of bears would be the brown bear, polar bear, and the giant panda. The three species I choosed for the research are the Giant Panda (Aliuropoda Melanoleuca), the Polar Bear (Ursus Maritimus Maritimus), and the Tibetan Blue Bear (Ursus Arctos Pruinosus). The Giant Panda (Ailuropoda melanoleuca) are one of the rarest in the Ursidae family, as well one of the most peaceful mammals. They are found in the mountains and bamboo forests in western china; there are as…

Pole, at least one polar bear is tightly grasping onto a single slab of ice that barely supports its body weight of over two-thousand pounds. Due to increasing sea levels, the ice that the polar bear is lying on will evaporate in less than two months. Paddling to find land will lack success as miles of shark-infested waters and several other threats lie between it and a temporary Shangri-la. Its chances of survival are slim, but to lower this probability even further, the polar bear is…