WILLIAM ERVIN / SCIENCE PHOTO LIBRARY WILLIAM ERVIN / SCIENCE PHOTO LIBRARY
Killer whale dorsal fin. View of the dorsal fin of a female killer whale, or orca (Orcinus orca). These predatory dolphins inhabit all seas except for the extreme polar regions. Killer whales may reach lengths of over 9 metres although the females are usually smaller. The females' dorsal fins are small and curved, as seen here, but the males' fins are triangular, and may be almost two metres tall. They live in groups of between two and 40 individuals, and eat almost anything, including seals, penguins, fish, whales and other dolphins. They rarely, if ever, attack humans. They have no natural predators. Photographed in Johnstone Strait, British Columbia, Canada.
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