2015-24-04-sothebys-egg Image via Sotheby's

The elephant bird egg has an estimate of $45 700-76 000. The elephant bird was native to Madagascar and was what biologists believe to be the largest eoviparous animal to have lived as it grew to 3 meters and weighed in at a colossal 450 kg. 

It went extinct in the first half of the 17th century as a result of hunting and deforestation caused by European settlers in its habitat.

As this egg is in a "generally in very good condition" it is highly sought after. It has come from the collection of natural artifacts collector Otto Alfred Heimburger.

Check out the egg here.

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