pyracantha, rowanberry and contoneaster berries

Mine seem to ignore the rowan berries on the grass although they may snack out when I'm not looking! The pigeons love pyracantha so they shouldn't be a problem....if they can reach them through the deadly spines!!! The wild birds love cotoneaster too don't they? I suppose chickens are birds....? I think they usually know what's good/not good to eat.