Scientists have discovered the world's oldest globe of the New World, dating back to the early 1500s - and it is carved onto ostrich eggs.
The previously-unknown globe, which is about the size of a grapefruit, was made from the lower halves of two ostrich eggs, and dates from the very early 1500s.
Until now, it was thought that the oldest globe to show the New World was the "Lenox Globe" at the New York Public Library, but researchers said that this Renaissance ostrich egg globe was actually used to cast the copper Lenox globe, putting its date to 1504 AD.
The globe reported in The Portolan, the journal of the Washington Map Society, reflects the knowledge gleaned by Christopher Columbus and other very early European explorers including Amerigo Vespucci after whom America was named.
The author points to Florence Italy as where the globe was made, and offers evidence that the engraver was influenced by or worked in the workshop of Leonardo da Vinci.
"When I heard of this globe, I was initially sceptical about its date, origin, geography and provenance, but I had to find out for myself," said author S Missinne, an independent Belgian research scholar in the journal article.
"After all no one had known of it, and discoveries of this type are extremely rare. I was excited to look into it further, and the more I did so, and the more research that we did, the clearer it became that we had a major find," he said.
The globe was purchased in 2012 at the London Map Fair from a dealer who said it had been in an "important European collection" for many decades.
The current owner made it available to the author for his research, which included scientific testing of the globe itself, computer tomography testing, and carbon dating, assessment of the ink used to colour its engraved surface, and close geographical, cartographic, and historical analysis.