I saw this Moorhen lacking red pigment on the bare parts at the entrance lake to the London Wetlands Centre today. As well as having an all yellow bill and frontal shield it also lacked the red colour to the base of the legs.
Here is a link to some photos of it:
I had never seen a Moorhen looking like this before and was wondering whether anyone else had. Is the lack of red pigment on the bare parts a relatively regular phenomenon amongst birds?