How Do We Know Anything About Migrating Birds?

Braelei Hardt - National Wildlife Federation

                                                                                                                    (Image: NWF)

Each August, billions of birds rally themselves for the long, dangerous migration south. But how do they do it, and what is involved in a bird's treacherous journey? Learn how everything from food supply to the aerosphere plays a factor in a bird's incredible trek each year.

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