A nice chance with this local. Swam by slow and close. In no hurry giving me plenty of time to focus on his eye.
View large and you can see the yellow colored pupil, horizontal slit. I think the differnce in their eyes compared to most other animals is what gives them that ‘evil’ look.

He’s dragging around a good amount of duck weed too.
WOW! We have nothing dangerous in the U.K….superb photo!
It takes a bit to get comfortable with them as neighbors. And never get too comfortable. LOL Thanks.