Most bear species are known to be able to crossbreed to produce hybrids. However, many matches produce offspring that is infertile or doesn’t live to maturity due to large genetic differences. Polar and brown bear hybrids are on the other end of the spectrum as they survive and are fertile and able to breed with each other or either of the species. At least six cases of polar/brown bear hybrids in the zoo and one in the wild have been reported (that includes Kodiak and Grizzly bears that are considered to be just varieties of brown bears). Zoos have also produced Malayan sun bear/sloth bear, Asian black bear/sloth bear, and Asian black bear/spectacled bear offspring; and a possible black bear/sun bear hybrid was captured in the wild.
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