I have one large specimen from the groynes at Barton-on-Sea (Hampshire) that is stuck to the rear glass of the tank. The only trace of activity is that about a square foot of the glass is kept free of algae. It doesn't usually stray far from its home, but once it surprised me by turning up on the side glass of the tank. Before that, I had assumed that it wouldn't be able to navigate a right angle between two panes because its shell would get in the way, and I still don't know how it did it.
It isn't much to look at, but it's useful for keeping the glass clean, and I might get a second one.
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