David Hartley writes

The water pressure isn't high enough for this. The cattle nearly empty the tank
at times. However what should work would be a mesh fitted with floats so that
it's always a couple of inches below the surface.

We put some old pallets to float in the trough. The bird should be able
to get onto them.

Thinx: probably time we put some more in. I expect the old ones have
become waterlogged and sunk.

--
Oz
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