Kittens younger than 8 weeks old are the most vulnerable population at animal shelters. Hannah Shaw (AKA The Kitten Lady) gave a presentation at Cat Camp in NYC this past May and I learned a lot about neonatal kittens. In many shelters, there are not enough resources to care for these kittens and they are euthanized. The best thing to do if you find kittens, is to wait 3 to 4 hours (assuming the kittens are not in danger) to see if the mama cat returns as she is best equipped to care for them. If she does not return, find someone to foster the kittens. Once they reach 8 weeks old, they are adoptable, preferably in pairs so they have a playmate and will be less dependent on you for entertainment. Hannah explains this better than me. Her website is an amazing resource for kitten care and issues. Read more here: http://www.kittenlady.org/kittencrisis