Beginning Jan. 18, 2022, the Zoo is open Thursdays, Fridays, Saturdays and Sundays from 8 a.m. to 3 p.m. 

Entry passes are required for all guests, including infants. 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. Select animal buildings remain closed.

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Ellen Welti, Ph.D.

Ellen Welti is a community ecologist working at the Smithsonian's National Zoo and Conservation Biology Institute's Conservation Ecology Center. She is part of the Great Plains Science Program based in the short and mixed-grass prairies of Montana. Her work focuses on plant-insect interactions, responses to altered biogeochemistry, and grassland ecosystems.