The blue eggs of an American robin in New Jersey, USA

No egg dye required. Easter

The American robin doesn't go out of its way to hide its colourful eggs, nor does it need paint to celebrate Easter! Thanks to a process in the mother's blood, her eggs - which she can lay up to three times each year - are always this lovely shade of blue. There’s even a name for this natural hue, 'robin's egg blue'.

The American robin isn’t the only bird that produces coloured eggs. The emu (greenish-blue), great tinamou (turquoise), peregrine falcon (mottled brown), and red-winged blackbird (light blue with black spots) are just some of the others that can produce eggs worthy of an Easter egg hunt.