Okay, normally I'd just say this is a fluke, a chimera, two yolks fertilized in one egg, and the two became one bird, like when you mix two colors of Play Doh and wad them up into one shape. Except there was another bi-colored bird in this cage for several years, I kept him hoping for crazy to get another one. Sold him last December, and then... THIS thing fledged... whatever it is, it is LONG odds, either way, Mosaic (calico) gene, or chimera, either way, very long odds.
