1. Possible explanations.
People may have seen a big man dressed with furs and thought it was an animal, a Yeti.
2. What do you think of... Loch Ness Monster?
Although it’s fun to think there is a monster in a lake, I think the Loch Ness Monster doesn’t exist. It’s a good item for the tourism of the place but if the monster have existed, scientifcs would have find it. So, perhaps 100 years ago people may saw an animal and the legend becomes bigger and bigger.