What are Calico Critters? They start with cute Baby Critters and are multiplying very quickly. Baby Calico Critter Families are sweeping the nation - we can't get enough of them. Parents who were the right age during the Sylvanian Families craze will likely feel nostalgic when they see Calico Critters, but these new products have quite a few more features than those originally available. Characters include mice, rabbits, bears, cat critters, hedgehogs and more. Each one has its own unique personality and backstory. For example, Sugar Bear Brother Brian is a quiet, introspective artist, while Silky Cat Sister Susie loves to go on camping adventures.