Rockhopper Penguin

Why did penguins lose the ability to fly? What's up with those yellow eyebrows? Does expertise come at a cost? Find out all of these things and more on this episode of Species.

Bibliography: https://docs.google.com/document/d/1xoa9Z6KnhD-WTvWYoWfnlnUI9YAxz3mba5r7YQRusbI/edit?usp=sharing