Just wait, pretty soon, he'll do even more.
My CalKing is like yours, but I got him as an adult. He's a nice snake, but handling tends to get his system going. When I handle him for about thirty minutes to an hour, he defecates. Sometimes, these snakes will do that when they are frightened or startled. With my guy, the activity of being handled just gets his system going. He'll be sitting there quietly and suddenly let go.
He also musks sometimes when I pick him up. Other times, he's perfectly okay with being handled. The secret is to get him when he's in a good mood.
My snake also rattles his tail sometimes. There's no one event that leads to this behavior, but he does it sometimes. He'll do it when he's startled, and he'll do it when he's excited about feeding.
These behaviors can be a challenge, but they are part of owning a CalKing. If you handle him regularly but not for too long, he'll get more used to being held and be better about not musking or peeing. The defecation will just depend on your snake's system. The good news about my guy having that trait is that I can keep him regular with regular handling.
Bill
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It's not how many snakes you have. It's how happy and healthy you can keep them.