Urban wildlife

We are foster-parenting five roundtailed groundsquirrels right now. Despite hours spent over two days trying to find mom and/or burrow, we could find neither for these not-quite weaned pups.

Added bonus, while looking for burrows and mom today, we found a groundsnake. No picture, but a beautiful vibrant orange on top, green/yellow on sides and belly.

I'm not one for bringing wildlife into the home, but how could I give these little guys up to the elements/predators, especially after my daughter (who found the first one) had fallen in love with them?

I estimate them at about four weeks old - about a week short of weaning. I hope in a few weeks they'll be old enough to let go. However, they are quite tame (for now), so I think the schoolyard is definately NOT the place to release them! We can't find wildlife rehabilitators for groundsquirrels around here, so it's up to us.