The Kraken is a mythological and legendary sea monster believed to have lived off the coasts of Norway and Greenland. The earliest descriptions of Kraken are that of crab like creature, however later legends describe Kraken as large octopus like beings. Tales frequently mention reports from sailors of Kraken attacking ships and pulling sailors underwater using their long tentacles. Although these stories are believed to be purely mythological, the 40-50ft long giant squid and the recently discovered colossal squid, which are known to have attacked boats, may provide an explanation for Kraken sightings.