A flock of more than 7,000 “Oc” storks have moved in the Tram Chim National Park in the southern province of Dong Thap, the park’s director Nguyen Van Hung said. Scientifically known as Anastomus oscitans, the “Oc” stork is among 32 species of wading birds listed on Vietnam’s Red Book of rare and precious animals. According to the director, the storks have got used to the environment in the park which has plentiful food and water all year round. An “Oc” stork weighs about 1-1.5 kilogrammes and has glossy black wings and tail with a green or purple sheen. It feeds mainly on snails, crabs, frogs, and other insects. The park is protecting this kind of bird to serve its research on wading birds as well as enrich its database. Tram Chim National Park boasts a rich biodiversity that earned it the recognition as the world’s 2000th Ramsar site in 2012. Established in 1985, the 7,313-hectare Tram Chim became a national park in 1998 and then the fourth Ramsar site in Vietnam. Tram Chim is home to 198 bird species, including 16 rare ones such as red-headed cranes, black-faced spoonbills, black eagles, great-billed herons and spotted-billed pelicans.