Salt water crocodiles of the Indian/Pacific Oceans routinely ride currents for hundreds of miles, know when to ride them, and can not only figure out when they're going the wrong way, but know how to get out of the current and wait until it switches to the direction they want:
One satellite-tagged crocodile, 12.6-foot-long male (3.8 meters) - left the Kennedy River and travelled 366 miles (590 km) over 25 days, timing its journey to coincide with a seasonal current system that develops in the Gulf of Carpentaria.
Another croc - a 15.8-foot-long male (4.8 meters) - traveled more than 255 miles (411 km) in only 20 days through the Torres Straits, which are notorious for strong water currents. When the reptile arrived at the straits, the currents were moving opposite to his direction of travel - he then waited in a sheltered bay for four days and only passed through the straits when the currents switched to favor his journey.
Amazing.
They also don't drill holes in the ocean floor, which makes them even smarter.
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