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from this pic it seems there is a wallow as they both have "tide marks" and they had been kept out the back all morning whilst cleaning was being done.
it was on here that i read they had a wallow.
The 'tideline' level indicates they've been lying in a muddy area but not deep mud or water.
The new bull from Dublin must be in the old shed, I wonder if there is an indoor pool in that? I can't believe Whipsnade have kept Hippos with no indoor pool for over fifty years, perhaps much longer, before this house was built, particularly as they have to be shut in during very cold weather-like now.