hi apple yesnot bad only when stressed i notice it on hatchlings but cant say ive noticed my adults doing it for a long time and i was handling one yesterday there temperment highly strung ,nervous but they settle qwick once your holding ,not the sort of snake you take for a walk on the grass less it was a foot ball oval they hiss,blow there throats out mock strike but are hard pressed to draw blood but can ive had a feeding resonse from large female but only once and was very surprized