Benign reptile bites

[columbidae]

Hello!

I am curious in knowing which reptiles would be least likely to draw blood and cause pain.
I'm pretty sure all Leopard geckos, Bearded dragons, corn snakes and pythons can draw blood... but certainly not all reptiles... I would think logically small lizards, small snakes and egg eating snakes would do the least damage.
What do you guys think? Can you name some species? Please tell me your experience!

(p.s I also would think feeder lizards would probably have to be slightly harmless or else wouldn't they seriously hurt the other reptiles(S) in the tank? That wouldn't be good for the seller or the buyer)

I appreciate all of your replies!