The reason they may not have mated until lately is that when gerbils are kept together from a young age, they have this "anti-incest" pheromone. It seem to delay breeding and pregnancy and exists because when living in huge family colonies in the wild, it prevents siblings from mating, and other forms of inbreeding from occuring. For the one baby, I'd say, since it's so young, it's best just to let the parents deal with it. With such a small critter, and being so young, it's best not to intervene... With pups, the parents know better than we do if they have any defects and will sometimes abandon one, to prevent predators from finding the other pups. The digging in the corner is stereotypical digging and they are doing this to burn off excess energy.
Last edited by kimsgerbils; 07-16-2006 at 01:50 AM.