Being such large beasts, moa spend most of their day feeding from trees and shrubs. Like other flightless birds, they swallow rocks to assist in grinding their food. They possess very large claws to protect themselves if cornered, but are otherwise relatively defenseless. Moa's eggs are between 5 and 9 inches in length and quite fragile: the birds lay few eggs and take about ten years to mature.
Beyond cursory accounts of native hunters, however, the moa's abilities and behavior are unconfirmed.