The Bird That Paints Its Eggs With Bacteria

It’s spring. A female hoopoe—a bird that looks like a pickaxe painted in a tiger’s colours—lays her eggs in a hole within a tree. The eggs come out milky blue, but they soon change colour to a mucky brown. That’s not just because the nests are dirty, as Wikipedia currently claims. It’s also because of a liquid that the female produces.

Lees meer: Not exactly rocket science