Thousands of fans have flocked to a Thailand zoo to celebrate the first birthday of Moo Deng, the baby pygmy hippo that's become a social media sensation.

Thailand’s Khao Kheow Open Zoo celebrated the first birthday of its beloved baby pygmy hippo, Moo Deng, who’s captured hearts worldwide and become an internet sensation. The zoo kicked off a four-day birthday bash starting Thursday,

Admirers flock to zoo to extend birthday wishes, one enthusiastic fan travelling from New York to partake in joyous occasion.