There's so much more to the Academy than first meets the eye. As one of the top natural and environmental science research institutions in the country, the Academy is home to dozens of scientists who work every day to discover new species, pioneer new research techniques, and monitor the health of our environment. Our renowned collections contain more than 18 million specimens, including such treasures as John James Audubon's birds and Lewis and Clark's plant collection. The Academy's Library and Archives are internationally recognized for their extraordinarily rare and historic collections, with more than 250,000 volumes from the 1500s to the present. We hope you enjoy exploring the Academy's wealth of knowledge and stories!

200 Years of Discovery

Explore 200 years of Academy history.

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The Ewell Sale Stewart Library of the Academy of Natural Sciences

Our Library

The Academy's Library and Archives are home to rare books and scientific treasures.

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Our Research

Academy researchers are leaders in their fields, exploring biodiversity, evolution, and environmental science.

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Online Exhibits

Delve deeper into the Academy through our online exhibits.

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Plan your visit, check out our new exhibits, and find out about upcoming activities.
Discover the past and explore the future of the natural sciences in our online exhibits.
Make a difference, browse our programs, and get involved with the natural world.