A Biodiversity Information System for Cheshire, Halton, Warrington & Wirral

I found this beetle last Sunday - it was swimming in a pond. I was about to rescue it, (I know, the whole 'do you/don't you help wildlife' debate), when it dived, resurfaced, climbed onto a leaf, then hurled itself back into the water. Clearly it didn't want rescuing. I got a few slightly blurred photos and I'm pretty sure it's an Aphodius sp, possibly A. granarius but every source I've consulted classifies it as a dung beetle and none mentions its aquatic capability. Can anyone confirm ID or suggest alternatives? The specimen was about 4mm long.
Cheers,
Tom.

Have you tried Andy Harmer?

Ta for the suggestion Anno. I haven’t got contact details for Andy so if you’ve got any I’ll message you separately for them. Another good show on BBC Radio Merseyside last Saturday by the way!
Cheers,
Tom.

It's Hydrobius fuscipes, a very common water beetle in he family Hydrophilidae.

Best
Don