20 Francs Titanoboa

The Titanoboa — Titanoboa cerrejonensis — was identified as a distinct species only in 2009, when fossil vertebrae excavated from the Cerrejón coal mine in northern Colombia were formally described. The snake lived roughly 58 to 60 million years ago and is estimated to have reached 13 meters in length, making it the largest snake in the fossil record. The DRC has no geological or paleontological connection to the species; this is a bullion-adjacent wildlife issue aimed squarely at the international collector market, part of a long series of Congolese silver coins featuring prehistoric fauna.