One of Oklahoma's most epic fish migration stories begins and ends in the Sargasso Sea, south of Bermuda. American eels hatch in the ocean and the willow leaf-shaped larvae continue to develop as they float with the current to the Atlantic Coast. After arriving, the juvenile eels transform into their gray to greenishbrown "elver" life form and move inland to more brackish waters. Eels continue moving inland and find freshwater homes in their next life stage. These "yellow eels" are nocturnal and can be found in Oklahoma's rivers and streams. The snake-like fish begin to mature after 5 to 25 years and make a return trip to the sea where they spawn and are assumed to die.