What is the miraculous aspect of the she-camel of Salih (peace be upon him)?

The miracle of Salih (peace be upon him) was the she-camel that Allah brought forth for his people from the rock after they asked him for a sign. She would drink one day, and they would drink on another day, and they would drink from her milk on the day she drank. One of them hamstrung her, so punishment seized them. Allah Almighty says: "He said, 'This is a she-camel. She has a share of water, and you have a share of water for a known day. And do not touch her with harm, or else the punishment of a terrible day will seize you.' But they hamstrung her, and became regretful. So the punishment seized them. Indeed in that is a sign, but most of them were not believers."