Do you know what a guinea-fowl is? Well, I don't. But I do know that this recipe works fantastically well with chicken (it's the only way I've ever tasted it). No blood oranges available? No worries! Use normal ones. Yes, it does taste good with normal ones. Did I just say good?!? I meant DELICIOUS! If you love fennel (not many people do, though) and olives (so many people who don't...) this recipe is for you! Have I told you already that it tastes WONDERFUL? I did? Then go ahead, buy the ingredients, cook it and don't forget to let me know how you liked it! Bye the way, the birds need to marinate for a day, so it's a good idea to marinate it either the evening ahead (if it's for lunch) or in the morning (if it's for dinner). Preparation time is estimated. Cooking time does not include chilling time. Recipe is by fantastic Jamie Oliver.