In Thai: นกยางโทนน้อย, nok yaang thon noi
Binomial name: Ardea intermedia, Johann Georg Wagler, 1827
The intermediate egret, median egret, smaller egret, or yellow-billed egret (Mesophoyx intermedia) is a medium-sized heron. Some taxonomists put the species in the genus Egretta or Ardea. It is a resident breeder from east Africa across the Indian subcontinent to Southeast Asia and Australia.
This species, as its scientific name implies, is intermediate in size between the great egret and smaller white egrets like the little egret and cattle egret, though nearer to little than great. It is about 56 – 72 cm long with a 105 – 115 cm wingspan and weighs c. 400 g, with all-white plumage, generally dark legs and a thickish yellow bill. Breeding birds may have a reddish or black bill, greenish yellow gape skin, loose filamentous plumes on their breast and back, and dull yellow or pink on their upper legs (regional variations). The sexes are similar.
Differences from great egret
The non-breeding colours are similar, but the intermediate is smaller, with neck length a little less than body length, a slightly domed head, and a shorter, thicker bill. The great egret has a noticeable kink near the middle of its neck, and the top of its longer bill nearly aligns with the flat top of its head. Close up, the bare skin of the great egret's gape line extends in a dagger shape behind the eye, while the Intermediate's is less pointed and ends below the eye. The intermediate tends to stalk upright with neck extended forward. The great is more patient, often adopting a sideways-leaning "one-eyed" stance.
Differences from little egret
Little egrets have yellow-soled feet and black bills. They often run after fish in shallow water. Breeding birds have long nuptial plumes on the back of their heads.
The intermediate egret stalks its prey methodically in shallow coastal or fresh water, including flooded fields. It eats fish, frogs, crustaceans and insects. It often nests in colonies with other herons, usually on platforms of sticks in trees or shrubs. Two to five eggs are laid, the clutch size varying with region.
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Kingdom Animalia Phylum Chordata Class Aves Order Pelecaniformes Family Ardeidae Genus Ardea Species Ardea intermedia
Thai: นกยางโทนน้อย, nok yaang thon noi
Ardea intermedia brachyrhyncha, Alfred Edmund Brehm, 1854
Common name: Yellow-billed egret
Range: Africa south of the Sahara
Ardea intermedia intermedia, Johann Georg Wagler, 1829
Common name: Lesser egret
Range: Japan to s India and Greater Sundas
Ardea intermedia plumifera, John Gould, 1848
Common name: Plumed egret
Range: New Guinea, eastern Indonesia and Australia
Mesophoyx intermedia, Johann Georg Wagler (1827) Egretta intermedia, Johann Georg Wagler (1827)
Not Evaluated (IUCN3.1)
Amphawa District, Samut Songkhram Ban Laem District, Phetchaburi Ban Lat District, Phetchaburi Ban Lueam District, Nakhon Ratchasima Ban Phai District, Khon Kaen Ban Phraek District, Phra Nakhon Si Ayutthaya Bang Ban District, Phra Nakhon Si Ayutthaya Bang Lamung District, Chonburi Bang Len District, Nakhon Pathom Bang Pa In District, Phra Nakhon Si Ayutthaya Bang Pahan District, Phra Nakhon Si Ayutthaya Bang Pakong District, Chachoengsao Bang Phra Non-Hunting Area Bang Pu Recreation Centre Bangkok Province Borabue District, Maha Sarakham Bueng Boraped Non-Hunting Area Bueng Khong Long Non-Hunting Area Chaiya District, Surat Thani Chaiyo District, Ang Thong Chatturat District, Chaiyaphum Chiang Dao District, Chiang Mai Chiang Khong District, Chiang Rai Chiang Saen District, Chiang Rai Chum Ta Bong District, Nakhon Sawan Doi Inthanon National Park Doi Lo District, Chiang Mai Doi Pha Hom Pok National Park Doi Saket District, Chiang Mai Fang District, Chiang Mai Hat Noppharat Thara - Mu Ko Phi Phi National Park Hat Yai District, Songkhla Huai Chorakhe Mak Reservoir Non-Hunting Area Huai Kha Khaeng Wildlife Sanctuary Huai Krachao District, Kanchanaburi Huai Talat Reservoir Non-Hunting Area In Buri District, Sing Buri Kabin Buri District, Prachinburi Kaeng Krachan National Park Kamphaeng Saen District, Nakhon Pathom Kanthararom District, Sisaket Kantharawichai District, Maha Sarakham Khanom District, Nakhon Si Thammarat Khao Laem National Park Khao Lak - Lam Ru National Park Khao Luang National Park Khao Nang Phanthurat Forest Park Khao Sam Roi Yot National Park Khao Sanam Prieng Wildlife Sanctuary Khao Sok National Park Khao Yai National Park Khao Yoi District, Phetchaburi Khlong Luang District, Pathum Thani Khlong Saeng Wildlife Sanctuary Khuan Khanun District, Phatthalung Khun Tan District, Chiang Rai Khura Buri District, Phang Nga Klaeng District, Rayong Ko Lanta National Park Ko Samui District, Surat Thani Ko Sichang District, Chonburi Kui Buri National Park Kumphawapi District, Udon Thani Kut Thing Non-Hunting Area Laem Pak Bia Laem Son National Park Lan Sak District, Uthai Thani Lan Sang National Park Mae Ai District, Chiang Mai Mae Chan District, Chiang Rai Mae Mo District, Lampang Mae Rim District, Chiang Mai Mae Taeng District, Chiang Mai Mueang Buriram District, Buriram Mueang Chachoengsao District, Chachoengsao Mueang Chanthaburi District, Chanthaburi Mueang Chiang Mai District, Chiang Mai Mueang Chiang Rai District, Chiang Rai Mueang Chonburi District, Chonburi Mueang Chumphon District, Chumphon Mueang Kalasin District, Kalasin Mueang Kanchanaburi District, Kanchanaburi Mueang Khon Kaen District, Khon Kaen Mueang Krabi District, Krabi Mueang Lamphun District, Lamphun Mueang Lopburi District, Lopburi Mueang Nakhon Nayok District, Nakhon Nayok Mueang Nakhon Pathom District, Nakhon Pathom Mueang Nakhon Si Thammarat District, Nakhon Si Thammarat Mueang Nan District, Nan Mueang Nonthaburi District, Nonthaburi Mueang Pathum Thani District, Pathum Thani Mueang Pattani District, Pattani Mueang Phang Nga District, Phang Nga Mueang Phayao District, Phayao Mueang Phetchaburi District, Phetchaburi Mueang Phitsanulok District, Phitsanulok Mueang Phuket District, Phuket Mueang Ratchaburi District, Ratchaburi Mueang Samut Sakhon District, Samut Sakhon Mueang Samut Songkhram District, Samut Songkhram Mueang Satun District, Satun Mueang Songkhla District, Songkhla Mueang Sukhothai District, Sukhothai Mueang Suphanburi District, Suphan Buri Mueang Surat Thani District, Surat Thani Mueang Surin District, Surin Mueang Tak District, Tak Mueang Trat District, Trat Mueang Uttaradit District, Uttaradit Non Sang District, Nong Bua Lamphu Nong Bong Khai Non-Hunting Area Nong Han Lake Nong Prue District, Kanchanaburi Nong Song Hong District, Khon Kaen Nong Waeng Non-Hunting Area Nong Ya Plong District, Phetchaburi Nong Yai Area Development Project Under Royal Init Pa Sak Chonlasit Dam Non-Hunting Area Pak Chong District, Nakhon Ratchasima Pak Phli District, Nakhon Nayok Pak Thale Pak Tho District, Ratchaburi Pha Daeng National Park Phaisali District, Nakhon Sawan Phayuha Khiri District, Nakhon Sawan Phra Nakhon Si Ayutthaya District, Phra Nakhon Si Ayutthaya Phra Phrom District, Nakhon Si Thammarat Phutthamonthon District, Nakhon Pathom Pran Buri District, Prachuap Khiri Khan Pran Buri Forest Park Rattanawapi District, Nong Khai Sai Noi District, Nonthaburi Samae San Island Samut Prakan Province San Sai District, Chiang Mai Sanam Bin Reservoir Non-Hunting Area Sankhaburi District, Chainat Sathing Phra District, Songkhla Si Maha Phot District, Prachinburi Sikhoraphum District, Surin Similan Islands Sirinat National Park Sri Phang-nga National Park Takua Pa District, Phang Nga Taphan Hin District, Phichit Tha Sala District, Nakhon Si Thammarat Tha Takiap District, Chachoengsao Tha Wung District, Lopburi Tha Yang District, Phetchaburi Thai Mueang District, Phang Nga Thalang District, Phuket Thale Noi Non-Hunting Area Thanyaburi District, Pathum Thani Thap Than District, Uthai Thani Thawat Buri District, Roi Et Thong Pha Phum National Park Wang Chan District, Rayong Wang Noi District, Phra Nakhon Si Ayutthaya Wat Phai Lom & Wat Ampu Wararam Non-Hunting Area Wiang Chai District, Chiang Rai Range map of Ardea intermedia in Thailand
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