Hello from Vancouver, Washington!

In the USA, I see few posts about Sonoran Black Kingsnakes. (Commonly called Mexican Blacks, except that naming animal species based on political maps is stupid. They exist in Arizona, too. Best to name them based on their geographical range - the Sonoran Desert.)

Are they popular in European collections?

Mine is 1.5 years old, has a 60-gallon vivarium resembling the Sonoran Desert, and loves to dig.