The Save the Kiwi trust mentioned on a Kiwi release day that when releasing Kiwis back into the wild there's a weight that the Kiwi must reach (1kg) before havi

The Save the Kiwi trust mentioned on a Kiwi release day that when releasing Kiwis back into the wild there's a weight that the Kiwi must reach (1kg) before having a chance to survive against ferrets, rats, and stoats. Perhaps the larger egg ensures a reduced exposure time between birth and 1kg for young Kiwis, which has helped those with larger eggs propagate more successfully?