Your morning adorable: Polar bear cubs frolic in St. Petersburg snow

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At the Leningrad Zoo in St. Petersburg, Russia, two polar bear cubs took advantage of the snow in their enclosure by ‘sledding’ -- albeit sans sled -- and roughhousing on a chilly Friday last week. (They looked for all the world like two joyous kids whose school has been canceled due to snow, we think.)

The cubs were born last November at the zoo, which is Russia’s second largest (behind the Moscow Zoo).

Twins like these cubs are common among polar bears (even the Berlin Zoo’s famously cute polar bear, Knut, had a twin, although it didn’t survive to adulthood). At birth, polar bear cubs are tiny (about one pound), toothless and blind -- but, of course, they become adorable rather quickly.

See more photos of the cubs after the jump!

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-- Lindsay Barnett