David Muir has the story of the 5-week-old pygmy hippo who refused to leave the pool on a hot summer day, until his mother ...

Thousands of excited fans flocked to a Thai zoo on Thursday to celebrate the first birthday of Moo Deng, the adorable baby pygmy hippo that has become a social media sensation. The Khao Kheow Open ...

See baby hippo refuse to get out of pool until he gets ‘mom stare' Pygmy hippo Mars didn’t listen to the zoo caretaker when play time in the pool was over, so his mom, Posie, had to step in.

Baby pygmy hippo Moo Deng eats fruit presented for her first birthday celebration at the Khao Kheow Open Zoo in Chonburi province, Thailand, Thursday, July 10, 2025. (AP Photo/Sakchai Lalit) ...

Baby pygmy hippo Moo Deng eats fruit presented for her first birthday celebration at the Khao Kheow Open Zoo in Chonburi province, Thailand, Thursday, July 10, 2025. (AP Photo/Sakchai Lalit) ...

The normal range for a hippo’s birth weight is 55 to 120 pounds (25 to 55 kilograms). Fiona now weighs a healthy 1,300 pounds (590 kilograms), according to the zoo.

Thousands of excited fans flocked to a Thai zoo on Thursday to celebrate the first birthday of Moo Deng, the adorable baby pygmy hippo that has become a social media sensation. The Khao Kheow Open ...

Visitors hold a soft toy of hippo Moo Deng as they lin up to watch Moo Deng, which turned one year old, at the Khao Kheow Open Zoo in Chonburi province, Thailand, Thursday, July 10, 2025.

The zoo sits on 800 hectares (almost 2,000 acres) of land and is home to more than 2,000 animals. It runs breeder programs for many endangered species including the pygmy hippopotamus.

The zoo held online auctions to celebrate Moo Deng's birthday, with photos, footprints and a food container on offer to raise funds for all the animals under their care. They also held an auction ...