For the full experience, make sure to visit this Interactive again on a larger screen.

You can explore the same topic in an easy-to-read Bird-ology Article or you can continue to the Interactive Feature.

What physical characteristic is unique to birds? You may think of beaks, feathers, wings, laying eggs, or walking on two legs. All of these are important elements of bird anatomy, but only one of them sets birds apart from all other living creatures.

Launch the immersive What is Unique to Birds? Interactive Feature section.

Launch What is Unique to Birds?

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