The comical looking hoopoe, a salmon pink bird from the Med with a headdress of feathers for a crown, makes a stink to give its chicks a chance.
The female lays her eggs in a tree cavity before covering them in an antimicrobial secretion that smells like rotten eggs.
This protects the eggs against bacteria - and also deters predators.
The chicks keep up chemical warfare by resorting to projectile pooping when threatened by predators.
Even insects get in on the act.
Mother earwigs look after their larvae throughout the winter, chewing up food to make it easier to eat and moving them if danger looms.
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