sentence: Penguins spend a great deal of time at sea, where they are in danger from seals.
sentences_after: On land, they usually live in areas where there were few dangers, until the arrival of European settlers with dogs and cats. Their wings have adapted to life in the sea and have become flippers which help them in swimming very fast.
concept_name: penguin
headings: Bird Flight Flightless birds
categories: Basic English 850 words