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Prof Britton said it could mean the samples are of a subspecies of brown bear, but added it was also possible they were of polar bears.

In Brazil, 80% of the cows are Zebus, a subspecies originating in India with a distinctive hump and dewlap, or folds of draping neck skin.

Out of the 16,724 known species and subspecies of ants worldwide, only a few exhibit blue coloration or iridescence.

Wild reindeer numbers have declined dramatically, with some subspecies listed as endangered, mostly due to habitat loss.

Populations of the northern spotted owl, a subspecies native to the Pacific Northwest, have declined by as much as 80 percent over the past two decades.