As reported by New Scientist, millions of years before Vikings traveled across the Atlantic, crocodiles swam thousands of kilometres from Africa to colonise the Americas. This conclusion comes from the most complete construction of the evolutionary tree of the genus Crocodylus. All four American species of crocodiles are most closely related to the Nile crocodiles of east Africa, and must have split away roughly 7 million years ago, long after Africa and South America began drifting apart 130 million years ago. Over 2800 kilometres of ocean lay between the two continents at the time concerned.
Palaeontologists have long hypothesized that crocodiles swam the Atlantic, but the finding by Evon Hekkala of Fordham University makes the case sound. Crocodiles are fine in salt water and can survive without food for six months. The females can carry viable sperm for several months after mating, thus they could be impregnated on one side of the Atlantic, travel across the ocean, then produce a litter of baby crocs on the other side. It is possible that the animals periodically got lost off the coast of Africa during storms or disorientation the floated across the Atlantic via the naturally westward-flowing equatorial ocean currents.
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