When I first got my two gliders from The Pet Glider they often would sniff my fingers then start biting too. What I did to stop this was just keeping my hands away from their faces while near them so they didn't develop a habit of biting me. Also I would just let them sniff my fingers from behind the bars of the cage. Of course I still interacted with them but I moved my hand away before they got the chance too nibble. It has been about four months since I've had my gliders and they only nibble softly when my hands smell like treats or lick me. Hope this helps.