Hi Nancy, When you post a new question here there's no need to address it to an individual forum member. Just leave it unaddressed, and whoever is around will answer it (hopefully). "pigeon-coloured" presumably refers to a shade of grey, which is the predominant colour of most pigeons: I personally visualise it as being a darker shade, like the tail feathers of the specimen above, but I'm not sure if everyone would feel the same.
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