C. niger may refer to: Cephalophus niger, the black duiker, a forest dwelling mammal species found in the southern parts of Sierra Leone, Liberia, Côte d'Ivoire, Ghana, Benin and Nigeria Chelonoidis niger, The Galápagos tortoise or Galápagos giant tortoise (Chelonoidis niger) is a species of very large tortoise in the genus Chelonoidis Chiloglanis niger, a catfish species Chlidonias niger, the black tern, a small tern generally found in or near inland water in Europe and North America Chrysops niger, a fly species Cyperus niger, the black flatsedge, a plant species native to the Americas Canis niger is an invalid taxon that used to refer to Canis rufus, also known as the Red Wolf.
See also Niger (disambiguation)