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The Zoo is open! Entry passes are required for all guests, including infants. Effective July 30, all visitors ages 2 and older are required to wear a mask in all indoor spaces at the Zoo, regardless of their vaccination status. Fully vaccinated visitors do not need to wear a mask in outdoor areas.
In a new study almost 20 years in the making, Smithsonian researchers and partners report some of the strongest evidence yet of the phenomenon of speciation reversal in two lineages of common ravens.
