AUTOPLAY 

In this photo Keeper Marie Magnuson with male lion cub Right Rib. Photo Credit Jen Zoon, Smithsonians National Zoo
In this photo: Keeper Marie Magnuson with male lion cub Right Rib. Photo Credit: Jen Zoon, Smithsonian's National Zoo
In this photoCurator Craig Saffoe with male lion cub Right Rib. Photo Credit Jen Zoon, Smithsonians National Zoo
In this photo:Curator Craig Saffoe with male lion cub Right Rib. Photo Credit: Jen Zoon, Smithsonian's National Zoo
In this photoCurator Craig Saffoe with male lion cub Right Rib. Photo Credit Jen Zoon, Smithsonians National Zoo
In this photo:Curator Craig Saffoe with male lion cub Right Rib. Photo Credit: Jen Zoon, Smithsonian's National Zoo
In this photo Keepers Kristen Clark (L) and JT Taylor (R) with female lion cub Left Rib. Photo Credit Jen Zoon, Smithsonians National Zoo
In this photo: Keepers Kristen Clark (L) and JT Taylor (R) with female lion cub Left Rib. Photo Credit: Jen Zoon, Smithsonian's National Zoo
In this Photo Biologist Leigh Pitsko and lion cub Left Hip (male) Photo Credit Jen Zoon, Smithsonians National Zoo
In this Photo: Biologist Leigh Pitsko and lion cub Left Hip (male) Photo Credit: Jen Zoon, Smithsonian's National Zoo
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Four African lion cubs took a brisk paddle at the Smithsonians National Zoo today and passed their swim reliability test. The cubs—three males and one female—were born at the Zoo March 2. (National Zoo)
Four African lion cubs took a brisk paddle at the Smithsonian's National Zoo today and passed their swim reliability test. The cubs—three males and one female—were born at the Zoo March 2. (National Zoo)
The cubs -- three males and one female -- had to prove they are ready to be on exhibit at the National Zoo. WTOPs Nick Iannelli shot this video.
The cubs -- three males and one female -- had to prove they are ready to be on exhibit at the National Zoo. WTOP's Nick Iannelli shot this video.
The cubs had to show that they could keep their heads above water, navigate to the shallow end of the moat and climb onto dry land. (WTOPNick Iannelli)
The cubs had to show that they could keep their heads above water, navigate to the shallow end of the moat and climb onto dry land. (WTOP/Nick Iannelli)
The 10-week-old cubs will make their debut to the public in mid-June. (WTOPNick Iannelli)
The 10-week-old cubs will make their debut to the public in mid-June. (WTOP/Nick Iannelli)
As keepers, its our duty to take every precaution to ensure the cubs survival, said Kristen Clark, an animal keeper at the Great Cats exhibit, in a news release. (WTOPNick Iannelli)
"As keepers, it's our duty to take every precaution to ensure the cubs' survival," said Kristen Clark, an animal keeper at the Great Cats exhibit, in a news release. (WTOP/Nick Iannelli)
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The zoo says it needs to make sure the cubs can swim, in case they get knocked into the moat by a parent or sibling. (WTOPNick Iannelli)
The zoo says it needs to make sure the cubs can swim, in case they get knocked into the moat by a parent or sibling. (WTOP/Nick Iannelli)
The cubs are now one step closer to being ready to explore the yard with their mother, Shera, the zoo says. (WTOPNick Iannelli)
The cubs are now one step closer to being ready to explore the yard with their mother, Shera, the zoo says. (WTOP/Nick Iannelli)
Animal keeper Kristen Clark says the zoo needs to know the cubs can pull themselves out of the water. The cubs were put in the shallow end of the most, which is about 2 12 feet deep. (WTOPNick Iannelli)
Animal keeper Kristen Clark says the zoo needs to know the cubs can pull themselves out of the water. The cubs were put in the shallow end of the most, which is about 2 1/2 feet deep. (WTOP/Nick Iannelli)
The side of the moat closest to the public viewing area is about 9 feet deep, the zoo says. (WTOPNick Iannelli)
The side of the moat closest to the public viewing area is about 9 feet deep, the zoo says. (WTOP/Nick Iannelli)
All four cats passed the test. (WTOPNick Iannelli)
All four cats passed the test. (WTOP/Nick Iannelli)
New Zoo Additions

New Zoo Additions

Check out the growing red panda cubs born at the Smithsonian.
Sesame Street Turns 45

Sesame Street Turns 45

View some of the classic moments and memorable guest stars over the years.
Underwater Puppies

Underwater Puppies

Seth Casteel photographed puppies under water for his new book.
Tour WTOP's newsroom

Tour WTOP's newsroom

See and hear life in the Glass Enclosed Nerve Center.
Click on the image above to see it at its original size.

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