20 Francs Quetzalcoatlus

Quetzalcoatlus northropi, the largest known flying animal in Earth's history with an estimated wingspan approaching 11 meters, has been the subject of significant paleontological debate — its flight mechanics still aren't fully resolved, with some researchers arguing it was primarily a terrestrial predator that launched from the ground rather than from elevation. The Democratic Republic of Congo has no fossil record of the species, which was native to Late Cretaceous North America, making this a purely thematic commemorative with no geographic or historical connection to the issuer.