Originally the Murphy patternless was called a leucistic. It is still called that by some people, but shouldn't. The blizzards are probably true leucistics, but since the name blizzard works there is no reason to change it.

Now to tell the difference. The patternless hatches out with a strange spot-type pattern that slowly disappears, and they tend to be a dull yellow as adults. The blizzards hatch out white and stay that way (as babies their head has a grayish color because their skin is semi-transparent).

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