Two Canadian biologists have reported sighting a handful of grizzly bears and hybrid grizzly/polar bears at unusually high latitudes in the Arctic, indicating that the interbreeding of the two bear species is becoming more common as the climate warms and grizzlies venture
farther north. The sightings of three grizzly bears and two hybrid bears, made in late April and May by biologists from the University of Alberta, represent an unprecedented cluster of these animals at such high latitudes. The biologists even took DNA samples from a grizzly bear at 74 degrees North latitude. Scientists suggested that some grizzly bears may be leaving the Canadian Arctic mainland and traveling roughly 400 miles over sea ice as they pursue a caribou herd that annually migrates over ice from the mainland to Victoria Island in the High Arctic. Unable to get back because of rapidly melting ice, some of these grizzly bears have evidently managed to adapt to life in the polar bear’s world, eating seals as they overwinter and mating with polar bears.