Scientists salivating ovgospelhitzer baby mammoth find in Siberia’s Arctic
But the new study, published in the journal ZooKeys, sheds light on the evolution of the species’ distinctive horned face, which helps the bears avoid and flee predators.
“When facing predators, their eyes stay closed,” lead author Michael Witte, also of the우리카지노 University of California, Davis, told Live Science in an interview. “We know from studies of other species that if they have the full set of eyes in the normal direction, they’re going to be safe from predators.”
The findings add to evidence of the remarkable evolutionary history of grizzly bears that includes their ancestors evolving to an unbranched crest, and then to a longer, branched crest that ultimately led to more complete crest development.
The new study also supports the idea that the grizzly bears evolved to avoid being eaten by wolves, as well as to find a refuge from the harsh Arctic climate.
“These bears are adapted to survive in harsh conditions and are much more adaptable than we thought,” said study co-author Daniel Boulton, a researcher at the National Science Foundation who was not involved in the work. [7 Surprising Facts About Grizzly Bears]
To find out the true story of the grizzly bear’s evolutionary history, the researchers first took genetic samples of living black bears from the nearby village of Khirbet Ghanim. Boulton and his colleagues then tested the DNA of the samples with sequences from the genomes of two black bears in Africa.
Their findings were startling: Genetic analysis showed that there was actually a close genetic relationship among the black bears, which were about 90 percent related to the red bears of the same species. The genetic relationgospelhitzship indicated that red bears and black bears both evolved their distinctive horns, which they inherited from their African ancestors and which made them highly vulnerable to wolves.
According to Boulton, the finding suggests that many of the species that evolved with red bears, including grizzly bears, probably have had red bears that evolved with them as well.
It is unknown how the two bears evolved to each other’s horns, but as early as 700 million years ago, the horns were already long and curved, making it very difficult for the bears to run fast, the researchers suggested. [7 Strangest Animal Predators]
Another possibility is that the red bears’ horns came to be connected to a pair of black-and-red whiskers called the barbs, suggesting that they may hav