Just in case anyone is currently wasting time and gold right now trying to breed for the rare blue x red combo, the 7 hour Furball.... WAIT!
It seems to be glitched at the moment. Breeding blue x red will give you the correct common hybrid (Sea Buffalo) but incorrrect rare hybrid (Birdball... the blue x yellow rare hybrid). I wasted 8 tries going for it with 5 Sea Buffalos and 3 Birdballs to show for it as of 10:15 PM EST. Sad that it took seeing the Birdball error 3 times before I was certain I didn't tap yellow by mistake lol.