I lived in a boat, in a marine , for three years.
the second ma’ma duck and her lil babies brave a destination in the harbor,seagulls get airborn.
One of my female office employees took her lunch over to that pond one day, and about 20mins later, I heard her screaming hysterically. I grabbed my Henry Big Boy lever action .357 Magnum rifle from the safe, had on my Kimber .45 and ran outside to help.
When I got to her, she was white as a ghost, and her lunch sandwich, chips and drink were spilled all over the large flat boulder many employees and visitors sat on to watch the geese and ducks.
She told me that a black & yellow 4-5ft “lizard or something” came out of the water and was staring at her, hissing and snarling. Yikes; I spent 3 days and evenings, off-and-on, sitting near the pond waiting for it to re-appear. Never did.
When she went home, I checked her desk for drugs and booze... LOL. She was very shaken and I have no doubt she saw “someting”, but after I did hours of research into what kind of large “lizard” could live that far north, there wasn’t any such amphibian. I even had a friend, the county Fish & Game Warden and two Sheriff Deputys come by to talk with her, and she convinced them she saw “something’, but none of us ever saw it again.