"HMS Supply" went back to Sydney, and Major Ross was left with over 500 people on the island. He quickly did things to make sure there would be enough food. Anyone taking food, or killing animals for food, without his permission, would be hanged. They were saved from starvation by the annual arrival of a sea bird, a petrel (Pterodroma melanopus), which nested in holes in the ground. Between 2000-3000 birds were killed for food every night. They were also able to eat their eggs. They called the petrel the "Bird of Providence", because they thought God must have sent the bird to save them. People also ate the tops of the palm trees. In August, two ships arrived, the "Justinian" and the "Surprize", which brought more food and 200 more convicts.