The butter was first proven dominant in 2001 by Mark and Kim Bell, and later proven incomplete dominant (more often called "co-dominant" in ball python slang). The butter is a beautiful velvety brown and yellow animal, similar to the lesser platinum; however, butters have more yellow in their pattern, and this color generally tends to strengthen as the snake ages rather than lightens as it does in lessers. They do typically have the brown head and pale eyes that lessers have. Breeding a butter with another butter, a lesser, or a mojave can produce the blue-eyed leucistic, a solid white snake with blue eyes.
We have a male butter in our collection. He hatched in 2011, and we think the month was May. He arrived here at Python Passion on June 28, 2011. We have many hopes for our butter: our main goal is to pair him with our lesser in hopes of producing some blue-eyed leucistics, in addition to a future project with our ghost. We also hope to pair him with some normals as well; his pattern has a lot of blackback areas that we hope he passes on to his offspring.