The Asian Openbill or Asian Openbill Stork (Anastomus oscitans) is a large wading bird in the stork family Ciconiidae. This distinctive stork is found mainly in the Indian subcontinent and Southeast Asia. It is greyish white with glossy black wings and tail and the adults have a gap between the arched upper mandible and recurved lower mandible. Young birds are born without this gap which is thought to be an adaptation that aids in the handling of snails, their main prey. Although resident within their range, they make long distance movements in response to weather and food availability.
The Asian Openbill Stork is predominantly greyish white with glossy black wings and tail that have a green or purple sheen. The name is derived from the distinctive gap formed between the recurved lower and arched upper mandible of the beak in adult birds. Young birds do not have this gap. The cutting edges of the mandible have a fine brush like structure that is thought to give them better grip on the shells of snails. The mantle is black and the bill is horn-grey. At a distance, they can appear somewhat like a White Stork or Oriental Stork. The short legs are pinkish to grey, reddish prior to breeding. Non-breeding birds have a smoky grey back instead of white. Young birds are brownish-grey and have a brownish mantle. Like other storks, the Asian Openbill is a broad-winged soaring bird, which relies on moving between thermals of hot air for sustained flight. They are usually found in flocks but single birds are not uncommon. Like all storks, it flies with its neck outstretched. It is relatively small for a stork and stands at 68 cm height (81 cm long).
Cò nhạn hay Cò ốc là một loài chim thuộc Họ Hạc. Cò nhạn thường sống ở các nước trên khu vực Nam Á và Đông Nam Á. Tại Việt Nam, loài cò nhạn chỉ xuất hiện ở một vài nơi như miền Tây Nam bộ và Tây Ninh với số lượng không nhiều…
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