sentence: Orcas have mostly black skin with white patches.
sentences_before: They are the largest dolphins in the world, called 'whales' because of their size.
sentences_after: They are found in all the world's oceans, from the cold of the Arctic to the tropical seas. They are really easy to identify because of their distinctive white and black colouring.
concept_name: orca
headings: Killer Whale
categories: Oceanic dolphins