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Hace 5 días · Some placodonts (like Cyamodus, Psephoderma, Henodus and especially Placochelys) bear striking resemblance to sea turtles (and turtles in general) in terms of size, shell, beak, mostly toothless jaws, paddle-shaped limbs and possibly other adaptations for aquatic lifestyle.
Hace 3 días · Polar bears (Ursus maritimus), the Arctic’s symbolic residents, face severe dangers from climate change.As apex predators, they are not only essential to the Arctic ecosystem but also act as indicators of the health of their surroundings. Over the last few decades, scientific predictions and models have increasingly warned of the possibility of polar bear extinction if current climate change ...
Hace 6 días · The polar bear is a major predator of Arctic seals and walruses, particularly pups. Bears may seek out seals, or simply wait for them to come by. Other terrestrial predators include cougars , brown hyenas and various species of canids , which mostly target the young.
Hace 4 días · Male polar bears weigh an average of 770 to 1,500 pounds. The largest subspecies of brown bears, the Kodiak bear, has an average weight of 660 to 1,320 pounds. Male grizzly bears whose range overlaps with polar bears average closer to 400 to 790 pounds. The largest polar bear ever recorded weighed 2,209 pounds, while few grizzly bears on record ...
Hace 5 días · The koala (Phascolarctos cinereus), sometimes called the koala bear, is an arboreal herbivorous marsupial native to Australia. It is the only extant representative of the family Phascolarctidae. Its closest living relatives are the wombats.
Hace 5 días · A new study that analyzed the genetics of eight known grizzly-polar bear hybrids found that they can all be traced back to a single female polar bear.
Hace 3 días · Plants and animals have developed specific adaptations that allow them to survive the extreme climate of the tundra. These adaptations include thick fur, dense hair, retention of dead leaves, and feathered feet.
