hair of polar bears is hollow, while the hair of grizzlies is either solid or has small hollow regions. This varies according to which part of the grizzly the hair is taken from. In the hybrid male, the paw hair was solid, but the dark back hair was somewhat hollow, albeit with "smaller empty regions than found in polar bear hair". The hair of the female hybrid, "contains a range of hollow regions". The hybrids demonstrated behavior more similar to polar bears than grizzlies. They stomped toys in a manner reminiscent of how polar bears break the ice, and hurled bags to the side "as polar bears may hurl prey". Grizzlies given the same bags do not demonstrate this hurling behavior. The hybrids were also observed lying down as polar bears do: on their bellies with rear legs splayed. The female hybrid bear, Tips, escaped her enclosure in November 2017, and was subsequently shot dead; zoo director Michael Boes reasoned that a tranquilizer would have taken 20 minutes to take effect, adding that "Tips' death was a great loss". References External links Hybrid Bears The North This Week (MP3) (CBC podcast including interviews with scientist Ian Stirling, guide Roger Kuptana, and hunter Jim Martell) Wildlife Genetics International 2006 in Canada Canadian folklore Grizzly bears Mammals of Canada Polar bears Ursid hybrids