Adoring fans from around the world converged in Thailand this week to celebrate the first birthday of Moo Deng, the baby pygmy hippo who became a social media sensation. John Yang reports.

Tanganyika Wildlife Park in Kansas welcomed a new baby pygmy hippo. The boy might just become a new internet celebrity.

A male pygmy hippo – the same species as Thailand's viral Moo Deng – was born at Tanganyika Wildlife Park in Goddard, Kansas ...