my rats do it all the time, but they are very motherly to all babies even if its not from their litter as many of you have most likely seen. Ive had to use surrogate mothers several times due to either death or too many pinks for one mother and the surrogates just take to them...mice on the other hand are not like that and they have killed their own babies which pissess me off coz that means no food for my smaller snakes...well until i get to the pet shop i go to to get mice pinks