Its expression looks almost human, doesn't it? The world's largest skink has an unusual social life. It mates for life, and couples form friendships with other couples. In fact, they form little communities in which the adults help each other take care of the young. Sometimes they even adopt orphans. All of this is terribly unusual among reptiles. This species is also called the monkey-tailed skink because its tail is prehensile. It uses this to help it climb.