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VISITORS: The Giant Panda House is currently closed and will remain closed through Wednesday, May 24.

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Earth Optimism: Oryx

Extinct in the wild for more than 35 years, scimitar-horned oryx are back in their native habitat thanks to international collaboration and the power of science. On Earth Day weekend, the Smithsonian is convening the Smithsonian Earth Optimism Summit, an event about the science that's working to solve complex conservation challenges around the globe.