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A litter of lion cubs at the Smithsonian National Zoo in Washington, D.C.

Jacquelyn Martin / AP

Lioness Shera herds three of her seven lion cubs, while they play, at the Smithsonian's National Zoological Park in Washington, D.C. on Saturday, Dec. 18, 2010, during the cubs' public debut.

Seven lion cubs were born at the zoo this year in two litters and were the first in more than 20 years. The mothers, Nababiep and Shera are sisters. You can see the lions on the zoo's lion cam.

What does it take to care for a pride of lions? Go behind the scenes with Great Cats Curator Craig Saffoe as he works with animal keepers and veterinarians to prepare the National Zoo's frisky lion cubs for their public debut. For more about the Zoo's growing pride and to watch them on live webcams: http://nationalzoo.si.edu/Animals/GreatCats/default.cfm?cam=LC4