A sleeper shark captured far from its recognized homeDevanshi KasanaOf all the sharks that biologists dont know a lot about, Greenland sharks (Somniosus microcephalus) stand out as especially mystical. A report of the encounter, the very first time that a sleeper shark has actually ever been found in the western Caribbean, was published this month in Marine Biology.Kasana and her coauthors write that the shark was either S. microcephalus or a hybrid between that types and the associated Pacific sleeper shark (S. pacificus).