Scientists at the Roslin Institute and the University of Edinburgh say they have discovered that bird cells don’t need to be programmed by hormones.

Instead they are inherently male or female, and remain so even if they end up mixed together in the same chicken.

It means a half-and-half chicken will have totally different plumage, body shape, and muscle structure on the two halves of its body.

It even affects the wattles on the bird’s head, and the spurs on its legs. They will be larger on the cockerel half, and smaller on the hen half, of the same bird.

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