Dodo bird

An egg allegedly belonging to a dodo bird is kept in the East London Museum in South Africa.

An excerpt from the article 14 facts about dodo bird

It was donated to the museum by its employee, Marjorie Courtenay-Latimer, whose aunt received the egg from a ship captain who claimed to have found it in the marshes of Mauritius. In 2010, the museum’s curator proposed genetic testing to determine its authenticity.