Plesiosaur thumb|right|alt=Model of a dinosaur in water|Reconstruction of Nessie as a plesiosaur outside the Museum of Nessie In 1933, it was suggested that the creature "bears a striking resemblance to the supposedly extinct plesiosaur",R. J. Binns (1983) The Loch Ness Mystery Solved, p, 22 a long-necked aquatic reptile that became extinct during the Cretaceous–Paleogene extinction event. A popular explanation at the time, the following arguments have been made against it: In an October 2006 New Scientist article, "Why the Loch Ness Monster is no plesiosaur", Leslie Noè of the Sedgwick Museum in Cambridge said: "The osteology of the neck makes it absolutely certain that the plesiosaur could not lift its head up swan-like out of the water". The loch is only about 10,000 years old, dating to the end of the last ice age. Before then, it was frozen for about 20,000 years. If creatures similar to plesiosaurs lived in Loch Ness they would be seen frequently, since they would have to surface several times a day to breathe. Due to the lack of plankton, there isn't enough food in Loch Ness to sustain a family of Plesiosaurs.
Plesiosaur thumb|right|alt=Model of a dinosaur in water|Reconstruction of Nessie as a plesiosaur outside the Museum of Nessie In 1933, it was suggested that the creature "bears a striking resemblance to the supposedly extinct plesiosaur",R. J. Binns (1983) The Loch Ness Mystery Solved, p, 22 a long-necked aquatic reptile that became extinct during the Cretaceous–Paleogene extinction event. A popular explanation at the time, the following arguments have been made against it: In an October 2006 New Scientist article, "Why the Loch Ness Monster is no plesiosaur", Leslie Noè of the Sedgwick Museum in Cambridge said: "The osteology of the neck makes it absolutely certain that the plesiosaur could not lift its head up swan-like out of the water" The loch is only about 10,000 years old, dating to the end of the last ice age. Before then, it was frozen for about 20,000 years. If creatures similar to plesiosaurs lived in Loch Ness they would be seen frequently, since they would have to surface several times a day to breathe. Due to the lack of plankton, there isn't enough food in Loch Ness to sustain a family of Plesiosaurs.