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Grolar Bear or Pizzly? An ursid hybrid is a bear that is the offspring of two different species or subspecies of the bear family. Brown bears, black bears, grizzly bears, and polar bears have all produced hybrid offspring, but nearly all were bred in captivity. In 2006, a bear shot by a hunter in Canada's Northwest Territories was later confirmed by DNA testing to ...
New Insight into Bear Hibernation An in-depth study of hibernating bears has revealed some surprising facts about the biological changes they undergo while in this inactive state. Unlike small mammals, hibernating bears experience only a moderate reduction in body temperature, yet their metabolisms plummet much more dramatically, to just 25 percent of their normal rate. In addition, bears' hearts rates drop so low that 10 ...
Hominid Fossil Sheds Light on Evolution of Walking The partial skeleton of an early hominid known as Australopithec us afarensis discovered in a mud flat of the Afar region of Ethiopia suggests that human ancestors were walking upright earlier than previously thought. Dated to about 3.6 million years ago, "Kadanuumuu"—the newly found skeleton—is some 400,000 years older than the famous "Lucy," which was among the earliest upright walking ...
World’s Oldest Footprints Found in Poland Fossils from a disused quarry in southeastern Poland have yielded the oldest evidence of four-legged animals walking on land, pushing back the timeline of vertebrate evolution by millions of years. The footprints were made by tetrapods-four-legged vertebrates-about 397 million years ago, some 18 million years earlier than they were thought to have emerged. The creatures probably resembled crocodiles, may have ...
Frog’s Teeth Evidence of "Re-Evolution"? Dollo's law is a scientific principle proposed in the late 19th century that asserts that traits lost in the process of evolution cannot reappear in that line of organisms. However, in the last decade, scientists have identified several attributes that have apparently "re-evolved" in certain organisms. Most recently, scientists studying frog fossils and DNA sequences concluded that frogs lost their ...