A White Mosaic is a glider that has very little coloration on their body other than white. They can have a few dark markings or even just a few very light gray markings, but not pure white like a Leucistic. Some even have little gray or black dots on their ears that breeders call “Cow Ears”.
The glider shown is McCartney. He is has some very light gray markings on his coat as well some markings on his ears. He is father to many of my most beautiful joeys.