My sinaloan hides all day. He comes out at about 9-10pm and can be seen roaming around his cage when the room he is in is dark. Definately not a good "display snake."
However, I trust my sinaloan in just about every situation. He gets handled by small children, and does just fine (with supervision of course). He is completely "head tame," he lets people touch his head and even his noise. He only ever flinches away when someone moves their hand too quickly. He's turned people who are nervous and fearful of snakes into snake affectionados. This is just an account of one individual snake, but from my experience, sinaloans would make excellent snakes for teaching, handling and the like.
I got him when he was a little under a year old, so I can't tell you how he was as a hatchling.
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