When I was young we had several bunnies who were outgoing, active and friendly. Now I have two Dutch bunnies and they only sit. They have a very large enclosure with straw and hay. They were friendly and outgoing when young but now they are about two years old and seem to have lost their human social skills. They often just sit next to each other. They are healthy, not aggressive and very tame and easy to handle. When they free range in the house, they sit under a table and just sit. They are not afraid. So what's up with that?