Remi Masson / Group of Black bullhead (Ameiurus melas) shoaling to protect themselves against predators, River Rhone, Rhone-Alpes, France, July.

Remi Masson / Shoal of Black bullhead (Ictalurus melas) in a lake. Alps, France

Tony Heald / Black-faced impala (Aepyceros melampus petersi) young male Lying in Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park Namibia, March.

Tony Heald / Black-faced impala (Aepyceros melampus petersi) female leaping above Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park, Namibia.

Loic Poidevin / White stork (Ciconia ciconia) eating Black bullhead (Ameiurus melas) Vendee, France, July

Michel Roggo / Black bullhead / American catfish (Ameiurus melas) Europe

David Fleetham / Galapagos bullhead shark (Heterodontus quoyi), resting on sandy seabed, Galapagos Islands.

Alain Ghignone/ BIA / Great Cormorant (Phalacrocorax carbo) with Black Bullhead (Ameiurus melas) prey, Piedmont, Italy

Alain Ghignone/ BIA / Great Cormorant (Phalacrocorax carbo) with Black Bullhead (Ameiurus melas) prey, Piedmont, Italy

Alain Ghignone/ BIA / Great Cormorant (Phalacrocorax carbo) with Black Bullhead (Ameiurus melas) prey, Piedmont, Italy

Joel Sartore / Photo Ark / White bullhead (Ameiurus catus) portrait, Fish Conservation and Culture Lab. Captive, occurs in USA.

Joel Sartore / Photo Ark / Yellow bullhead (Ameiurus natalis) portrait, Albuquerque BioPark Aquarium. Captive, occurs in USA.