Mesophoyx intermedia

Mesophoyx intermedia (*)

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Aves
Subclassis: Carinatae
Infraclassis: Neornithes
Parvclassis: Neognathae
Ordo: Ciconiiformes
Familia: Ardeidae
Subfamilia: Ardeinae
Genus: Mesophoyx
Species: Mesophoyx intermedia
Subspecies: M. i. brachyrhyncha - M. i. intermedia - M. i. plumifera

Name

Mesophoyx intermedia (Wagler, 1829)

Reference

Isis, oder Encyclopädische Zeitung 22 col.659

Vernacular names
Internationalization
English: Intermediate Egret

The Intermediate Egret, Median Egret,[2] or Yellow-billed Egret (Mesophoyx intermedia) is a medium-sized heron. It is a resident breeder from east Africa across tropical southern Asia to Australia. 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. 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 90 cm tall 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.

Some taxonomists put this species in the genus Egretta or Ardea.

The Intermediate Egret stalks its prey methodically in shallow coastal or fresh water, including flooded fields. It eats fish, frogs, crustaceans and insects.

Difference from Great Egret
near Hodal, Faridabad, Haryana, India

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.
Difference 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.
References

^ BirdLife International (2008). Mesophoyx intermedia. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 9 February 2009. Database entry includes justification for why this species is of least concern.
^ Grewal, Bikram; Bill Harvey and Otto Pfister (2002). Photographic guide to birds of India. Periplus editions.

Other References

Birds of The Gambia by Barlow, Wacher and Disley, ISBN 1-873403-32-1
Birds of India by Grimmett, Inskipp and Inskipp, ISBN 0-691-04910-6

 

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