The platypus is one of the very few mammals that lay eggs instead of giving birth to young. But, instead of the usual hard-shelled eggs, these eggs are soft-shelled and leathery.
Ostrich eggs are the largest eggs laid by any bird. They have a thick and extremely hard shell, creamy-white colour and can weigh up to 1.4 kilograms.
Emu eggs look very similar to ostrich eggs but are slightly smaller. What's quirky about them is that Emu eggs have a dark green colour and a smooth surface.
One of the scariest birds in the wild, Cassowary lays eggs which look quite different and weird. Their eggs have a bright, pale green or blue colour and are covered in a thick layer of calcium carbonate.
With a very bright, brick red colour, Cetti's Warbler lays small, soft eggs. The eggs also have a unique speckled pattern, which helps them blend with their surroundings.
The eggs of the common murres look extremely similar to Easter chocolate eggs and have different colours and gradients on them. Common murres lay blue, white, and soft green coloured eggs and have conical tops.
The eggs of the American Robin are famous because of their bright blue colour as compared to the usual white eggs. American Robins also lay their eggs in cup-shaped nests made of mud, grass, and twigs.
Surinam toads have one of the strangest egg-laying behaviours. These toads, instead of laying eggs externally, carry their eggs embedded in her back.
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