I recently saw a travelogue on the Seychelles Islands and they showed a picture of a big nut called Coco de Mer.
Your picture looks a lot like what I saw in that presentation.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Independence of the Seas 12/29/2013 Booked!