The Loch Ness Monster, or Nessie, is probably the world's most famous cryptid. it is a gray-skinned cryptid that is about 40 feet long. It is plesiosaurid in shape and had been consistently sighted for hundreds of years. Photos and videos abound of it, yet no one can prove that it exists due to the problems with scanning the Loch. Loch Ness is very deep, very large, full of fish and frigid, so even when large objects show up on sonar, no one can tell whether they are monsters or schools of fish. The most likely theory as to what this beast is and where it came from matches the explanations for many other lake monsters: A small population of the creatures survived the mesozoic era, migrated into the lake while it was still connected to the ocean, and eventually became trapped there when the lake was naturally closed off. If this is the case, Nessie may be of the same species as the Lake Storsjon monster, Morag, and other lake creatures. Whatever the case, Nessie is one of the most likely cryptids to exist and it probably will not be able to conceal itself forever from humanity's advancing technology.