EELS!

All eels are born in one place, in the middle of the Atlantic Ocean in the Sargasso Sea.

* whichever species whether American (Anguilla Rostrata) or European (Anguilla Anguilla), after they reach a certain age they depart for their seperate countries! (How they know where to go and which lot to head off with is anybody's guess) 

They also return here to breed and to die. All of them!

Rostrata live for up to forty years, European ones twice that at up to as much as eighty years old.

Their blood is toxic to humans . . . . . .