Lithops is a genus of succulent plants in the ice plant family, Aizoaceae. Members of the genus are native to southern Africa. The name is derived from the Ancient Greek words λίθος (lithos), meaning "stone," and ὄψ (ops), meaning "face," referring to the stone-like appearance of the plants. They avoid being eaten by blending in with surrounding rocks and are often known as pebble plants or living stones. http://en.wikipedia.org/wiki/Lithops #Succulent #Lithops
Kalanchoe or "Mexican Hat" - This unique plant reproduces by making "babies" that appear around the edges of each leaf, which can be gently pulled off and replanted. They will also fall off on their own and will continue to grow.