Bird-egg coloration has been studied for more than a century. Its function is only partly understood, however, and most researchers may have ignored something fundamental: what's happening inside the egg.
![Catalogue of the Collection of Birds' Eggs in the British Museum : British Museum (Natural History). Department of Zoology. [Birds] : Free Download, Borrow, and Streaming](https://i.pinimg.com/originals/43/22/8f/43228f2ce469a00302070ca72ef4b406.png)
