On 3 June 2011, Singapore Post released a se-tenant strip of four stamps featuring the oriental small-clawed otter. An endangered species that is native to Singapore, this mammal has been spotted at the northwestern coast, the Sungei Buloh Wetland Reserve, and on offshore islands such as Pulau Ubin and Pulau Tekong. Often found in zoos, children are attracted to its playful and inquisitive character. The oriental small-clawed otter is regarded as vulnerable by the International Union for the Conservation of Nature and Natural Resources (IUCN) in the Red List of Threatened Species.
Over a year ago, SingPost approached local artiste Edmund Chen to design this stamp series. The graphics designer is Wong Wui Kong. In this issue, there are two 50 cent stamps and two $1.10 stamps. The postmark for the first day cover is designed by Chen’s daughter Yixin, 11. A total of 1000 limited edition collectors’ sheet was also released.