Six young smooth-coated otter pups of Bishan family romp on the riverbank in Singapore's inland waters on Nov 12, 2019. Bishan family of smooth-coated otters are renown in the world, tracked by otter-watching enthusiasts since 2014, where the first sighting of a pair of male and female otters was recorded in Bishan Park (hence the name Bishan family). (Xinhua/Then Chih Wey)

Young smooth-coated otter pups of Bishan family swim in the river in Singapore's inland waters on Nov 12, 2019. Bishan family of smooth-coated otters are renown in the world, tracked by otter-watching enthusiasts since 2014, where the first sighting of a pair of male and female otters was recorded in Bishan Park (hence the name Bishan family). (Xinhua/Then Chih Wey)

Young smooth-coated otter pups of Bishan family swim in the river in Singapore's inland waters on Nov 12, 2019. Bishan family of smooth-coated otters are renown in the world, tracked by otter-watching enthusiasts since 2014, where the first sighting of a pair of male and female otters was recorded in Bishan Park (hence the name Bishan family). (Xinhua/Then Chih Wey)

Six young smooth-coated otter pups of Bishan family romp on the riverbank in Singapore's inland waters on Nov 12, 2019. Bishan family of smooth-coated otters are renown in the world, tracked by otter-watching enthusiasts since 2014, where the first sighting of a pair of male and female otters was recorded in Bishan Park (hence the name Bishan family). (Xinhua/Then Chih Wey)