Spontaneous burps

I have finally figured out a difference between my three chicks. For a while now I'd just been guessing by size, but they're way too close in size to be separated. But today I took them outside to get some of the beautiful, rare, occurrence that is Oregon sun. And while out there I just stared at them for quite a while until I realized that each of them has a whitish blotch on their heads, but the blotches were different for each chick! The biggest chick has the whitest blotch and the whiteness is very concentrated to one area on the head, kind of like a spot. She has no name yet. The medium'ish looking chick has also a very white blotch, but it's less concentrated to one area, but rather scattered. His name is Moose. Named by Boney-M because she never got to name the last batch of chickens we had and wanted to this time around. The smallest looking chick has an off white yellowish blotch and H's friend AKe has already claimed it as "her chick." Every time she comes over she demands to see it and hold it for at least five minutes. This one is also unnamed. Suggestions anybody? Come on I know you' got ideas out there. The largest chick still is unnamed.