A 121-million-year-old baby arboreal bird, fossilised while still curled in its egg, has been found in China. The fossil is thought to be the most ancient unborn bird ever discovered.

It has piqued researchers' interest because it had feathers, whereas many modern flying birds are naked and helpless when they first hatch. The authors say this supports the view that birds developed the strategy of hatching featherless later in history.

Wow!!! Birds developed the strategy of hatching featherless?

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