Panda twins celebrate 1st birthday at Vienna Zoo

VIENNA, Austria (KGO) -- Panda twins are celebrating their very first birthday at the Vienna Zoo in their own way.

The adorable pair marked their special day with a party.

The zoo even presented the little pandas with wrapped presents filled with treats.

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But "brother" panda may be wondering, "Where's my sister?"

Turns out she didn't show up to the party.

The zoo says she is very shy and feels more comfortable inside, away from all the people.

Brother on the other hand is extremely playful.

The zoo says he's a total cuddle-bear just like his dad.

His name is "Fu Ban", Chinese for lucky companion. His sister's name is "Fu Feng," which means lucky phoenix.