I AM NOT ON THE DARKNESS BUT U CAN SEE THE DIFFERENCE BETWEEN BIRDS ON IT AND ONES NOT, I STOPPED RACING THIS WEEK BECAUSE MY BIRDS ARE TOO FAR ON THE MOULT, I THINK THE EXTRA HOT SPELL WE HAD HAVE BROUGHT THEM ON QUICKER THAN NORMAL, BIRDS ON DARKNESS LOOK LIKE YEARLINGS, I AM NOT ON IT BUT YES I THINK IT MAKES A DIFFERENCE, BUT LIKE EVERYTHING ELSE IN THE PIGEON GAME IT'S NOT THE ANSWER TO WINNING ,I KNOW FANCIERS ON IT AND NOT WINNING AND FANCIERS WHO ARE NOT AND WINNING, SO ITS NOT JUST DARKNES, THIS IS ONLY ONE OF THE MANY POINTS U NEED TO WIN.