Retro fridays and pocket critters

There isn't much to pocket critters but they were extremely popular in the early to mid 90's then they all seemed to have vanished. They are a little oval shaped plastic toy with a clear window and little plastic animals and scenery, they were little portable dioramas you could take with you and that was that. Somehow they were everwhere and they are a product of a simpler time when all it took was a little plastic toy to entertain kids