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Here's everything you never knew about birds.

This video answers all of the following questions:
How do birds breathe?
Do birds have hollow bones?
How do birds make sound?
How do birds sing?
What are the strangest bird calls?
How do birds sing two notes at once?
What is a gynandromorphic cardinal?
What are some bird group names?

Specimens used in this video are preserved at the Chicago Academy of Sciences. You can visit the Academy's collections at the Peggy Notebaert Nature Museum in Chicago, Illinois.

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