If the Loch Ness Monster is real, what's he been eating for millions of years?

Question by WhiteWolf359: If the Loch Ness Monster is real, what's he been eating for millions of years?
If "Nessie" is real (don't laugh...a carcass has been located in Loch Ness), what has he/she/it been living off of for all of these millions of years? Could a prehistoric creature evolve to eat local fish? Or has Nessie been cadging a few local farmers' sheep?


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