Photo of the Day: Endangered monk seal checks out divers

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The Hawaiian Monk seal is one of the most critically endangered marine mammals in the United States. It is also the the oldest species of seal on the planet. Hunted to the brink of extinction, they now teeter on the edge. This one, in typical curious seal fashion, came up to check out photographers as they dove along a beach in Hawaii -- a lucky and special encounter.

Learn more about this amazing species and see many more photos here.

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