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Nick Caloyianis

Centuries of heavy trans-Atlantic maritime traffic has littered North America's coastal waters with unfortunate ships like this small vessel near the Bahamas.

Centuries of heavy trans-Atlantic maritime traffic has littered North America's coastal waters with unfortunate ships like this small vessel near the Bahamas.

Basking sharks may look ominous, but their open mouth serves to filter zooplankton and other small creatures through their gill rakers.

The Greenland shark—the world's slowest swimming shark—cruises beneath some sea ice near Baffin Island in Canada.