Evolution, schmevolution.  Apparently, a wizard Jesus did it.  Or at least it was his dad.

PROF. FRINK: Yes, over here, n’hey, n’hey. In episode BF12, you were battling barbarians while riding a winged Appaloosa, yet in the very next scene, my dear, you’re clearly atop a winged Arabian. Please to explain it.

LUCY LAWLESS: Ah, yeah, well, whenever you notice something like that, a wizard did it.

FRINK: I see, all right, yes, but in episode AG4 –

LAWLESS: Wizard.

FRINK: [under breath] Aw, for glaven out loud.

Sometimes it’s all just one big Treehouse of Horror.