Multi-yolk eggs are also extremely rare – when more than 1 chick develops when a single egg cell.
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Wrinkled eggs are usually produced by older hens who are or used to suffer from an illness named avian infectious bronchitis.
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Factors such as stress and ageing can cause faded yet pigmented eggs to be produced as well.
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Last but not least, super-round eggs – one fetches a hefty price of at least $600! Bet you didn’t know such eggs exist!
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