Some years ago I was out with a shooting party not far from Snowdon

Some years ago I was out with a shooting party not far from Snowdon, in Wales, when turning past a large rock I came on a sheltered nook, and there in a nest made of dry grasses laid six tortoiseshell-and-white kittens about eight to ten days old. I was much surprised at this, as I did not know of any house near, therefore these must have been the offspring of some cat or cats that were leading a roving or wild life, and yet it had no effect as to the deviation of the colour. I left them there, and without observing the sex. I was afterwards sorry, as it is just possible, though scarcely probable, that one or more of the six, being all of the same colour, might have proved to be a male. As I left the neighbourhood a few days after I saw no more of them, nor have I since heard of any being there; so conclude they in some way were destroyed.

Fonte: Cats