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.

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

Thousands gathered at Khao Kheow Open Zoo to celebrate Moo Deng, a baby pygmy hippo and social media phenomenon, on her first birthday. The zoo organized four days of festivities, attracting international fans and raising funds for animal conservation.