well i thaw mine out in warm water, and give it to all of them in their viv's, they dont get taken out, only if im holding them or bathing them. they dont swallow any of their substrate and i hold the mouse by its tail and the snake strikes at it, and starts eating it right away, head first, and i keep hold of the tail till the snakes nearly at the end, then i let go. however my 2nd eldest female i cant do that, she gets fed on top of her log and shes a vicious eater. lol