The link that jstrangham21 posted shows an alleged picture of the Loch Ness. That picture was famous because it was literally the ONLY photo that hasn’t been dismissed as a fake. I’ll link it again for gigglers: Nessie photo
Then Scotland’s top dinosaur expert figured out that what we’re seeing there is a pygmy elephant mostly underwater. The elephant was from a traveling circus. Here’s a link to the article: link
Now about Bigfoot. His creator died in 2002. link
Sorry, but both the Loch Ness Monster legend and the Bigfoot legend are false. If I had to pick which were more likely, though, I’d pick Bigfoot. It’s more plausible that a creature of his size would go practically unseen while wandering such a large area, and it’s almost impossible that a dinosaur could effectively hide in a lake roughly 20 sq miles in size. :-/