Niue 2014 $2 Endangered Species Black Rhinoceros 1oz Silver Proof CoinIn the early 20th century, the Black Rhinoceros, Diceros bicornis, was the most plentiful of all Rhino species across the African continent. This relief engraving captures a delightful vista of the African grasslands. In the foreground, an endangered Black Rhinoceros dips its head to drink from a water hole. The scene is mirrored in the finely engraved water.