Step 1 : Introduction to the question "9. In some places one might be lucky enough to spot what creature known as Orcinus orca?"
...1. Great white shark 2. Blue whale 3. Bottlenose dolphin 4. Killer whale While whales and dolphins are mammals in class Mammalia, sharks are in class Chondrichthyes which are cartilaginous fish. Blue whales (Balaenoptera musculus) are baleen fin-back whales. Killer whales and bottlenose dolphins are both types of dolphins. The various species of bottlenose dolphins are classified in genus Tursiops, but killer whales are Orchinus orca and are sometimes called orca whales or simply Orca.
