It's a horse, what more can I say? 'It's likely to be this . . .' level of ID? I suppose it being in water it could be mistaken for a 'river horse' (Ancient Greek Hippopotamus). Sorry, I think I've been on iSpot too long today, I'd better let my brain cool down a bit!
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well you know its one of these funny mammal things, no green leaves or gills and spores so can't really be sure about them.
Lat/Lng: 50.7858, -1.526615
OS grid ref: SZ334985