Black-necked stork " Ephippiorhynchus asiaticus ", lesser adjutant " Leptoptilos javanicus " and Eurasian coot " Fulica atra " are rare birds inhabit in the national park.
2.
Egg dimensions measure 59.0 74.5 mm in length and 43.0 48.0 mm in width, are relatively small compared to the adult body size, and resemble those of " Leptoptilos javanicus ", but are slightly paler.
3.
Forsyth's ( 1889 ) casual remarks indicated that several species like black-headed yellow bulbul ( " Pycnonotus melanicterus " ), painted spurfowl ( " Galloperdix lunulata " ), lesser adjutant ( " Leptoptilos javanicus " ), and Indian golden-backed three-toed woodpecker ( " Dinopium javanense " ) which are now found only in small restricted areas were apparently quite common and widespread around late 19th century.
4.
The forest is also rich in bird life, with 286 species including the endemic brown-winged kingfishers ( " Pelargopsis amauroptera " ) and the globally threatened lesser adjutants ( " Leptoptilos javanicus " ) and masked finfoots ( " Heliopais personata " ) and birds of prey such as the ospreys ( " Pandion haliaetus " ), white-bellied sea eagles ( " Haliaeetus leucogaster " ) and grey-headed fish eagles ( " Ichthyophaga ichthyaetus " ).
5.
Globally threatened avian species listed on the IUCN Red List include : Baer s Pochard ( " Aythya baeri " ), classified as Critically Endangered and may be extirpated from the Thale Noi area and from Thailand, however data is lacking on this species; the Masked Finfoot ( " Heliopais personata " ) is Endangered; the Lessor Adjutant Stork ( " Leptoptilos javanicus " ) is Vulnerable, although it was once the most abundant species of stalk and the Spot-billed Pelican ( " Pelecanus philippensis " ) is classified as Near Threatened.