California gray whale (Eschrichtius robustus) caudal peduncle, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Caudal peduncle of thresher shark (Alopias sp.), showing finning scar, Nanfang'ao fish market, Suao, Taipei, Taiwan, Asia

The characteristic caudal "knuckles" of an adult California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon, Baja Peninsula, Baja California Sur, Mexico

Southern Right Whale (Eubalaena australis), caudal fin, South Africa

Fishermen with their catch early in the morning on the beach of Puerto Juarez, Cancun, Yucatan Peninsula, Quintana Roo, Mexico, Latin America, North America, Central America

Red Panda (lat. Ailurus fulgens)

Behind the huge caudal fin of a whale shark (Rhincodon typus), Madagascar