Did you read the text about orcas? Well, then try our quiz. The orca is the largest fish dolphin whale The dorsal fin can be up to 1.8 metres tall in all orcas female orcas only male orcas only The saddle patch lies behind each eye on the flukes behind the dorsal fin The flippers are paddle-shaped very small white Orcas were called 'whale killers' because fishermen saw how orcas got killed by other whales orcas killed people orcas killed other whales