How long have kiwi existed?

If one subscribes to the "old Earth" theory, sources vary. One scientific publication shows that kiwi fossils have been found dating back 42 million years. Another source states the oldest kiwi fossil is only one million years old, but the bird's ancestors must have arrived 60 million years ago. (See the related links)

If one subscribes to the "young Earth" theory, which puts the Earth at approximately 6000 years, then the Creation story indicates that birds were created on the fifth day.