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WASHINGTON (WUSA9) -- The National Zoo's African lion named Shera gave birth to four healthy cubs Sunday, zoo officials said.

This is the second litter of cubs for 9-year-old Shera, who delivered them in a seven-hour period from 8:27 a.m. to 3:17 p.m. The cubs are the fifth litter for their 8-year-old father, Luke. The first cub was born at 8:27 a.m. and appeared active and healthy.

The animal care team at the Zoo has been closely observing the family and all of the four cubs appear to be nursing, moving and vocalizing well, they said.

Kristen Clark, an animal keeper at the Great Cats exhibit says, "Like any new mom, she needs some peace and quiet to bond with her cubs, so we're giving her the solitude she needs. From what we've observed on the cam, her behaviors are right on point, and there's no need for us to intervene."

The cubs will not be on on exhibit until early summer but they can be viewed through the Lion Cub Cam.

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