BIRDS’ eggs are attractive, extraordinary and can also be good for breakfast. They come in many sizes, shapes and colours, and are an essential part of all birds’ ability to reproduce. Birds actually do put all of their eggs in one basket, and it is their patterning and colour, as well as a well-chosen nest site, which gives them the best protection. The colours of birds’ eggs are due to two main pigments: biliverdin, which produces blue and green colours, and protoporphyrin, which forms rusty-browns. Recent research has shown that two further pigments exist in the eggs of certain tinamou species, which contain bilirubin (yellow-brown) and uroerythrin (purplish-brown). Eggs can use a mix of pigments or only one. Research into biliverdin reveals that it is most likely produced in the…