Navel Fruit Tree (Omphalocarpum procerum, french: Arbre à mamelles). Only elephants can break the hard fruit pods by skewering them with a tusk. This tree is endemic to the Congo basin. (1036k)
Here are the pictures of Navel Fruit (Omphalocarpum procerum) with links to the pages on which they appear, links to the full sized picture, and the description of the picture with links to the entry in iNaturalist (inaturalist.org)
All pictures are © Dr. Günther Eichhorn, unless otherwise noted.
Congo Nature
Dr. Günther Eichhorn Travel Website
Soaring website