These chicks are native to New Zealand and hatched from large eggs. But they don’t have anything close to a relaxing life, and right from the start, they must defend themselves from predators and the elements. At birth, they have well-developed legs and beaks that make them capable of protecting, defending, and feeding themselves. Kiwis in general are extremely short-tempered and aggressive, and this personality trait develops at a young age. Once the chick reaches one kilogram, they’re able to chase and kick the intruder (Active Adventures).