National Geographic Society

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Timber wolf in the wild. Wolves have excellent night vision due to the mirrored membrane at back of their eyeball that reflects light back into the sensitive cells.

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The big bad wolf is 100 pounds of muscle and teeth, but it's born blind, deaf and weighing just 1 pound. Follow the transformation of a helpless pup into an accomplished killer. detail. The wolf hones its hunting skills over about two years of intensive training -- and the lessons are hard. Only the strongest survives to become leader of the pack, facing off in an epic battle against the mountain lion -- an animal nicknamed "the perfect predator."