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The grey partridge is a rotund bird, brown-backed, with grey flanks and chest. The belly is white, usually marked with a large chestnut-brown horse-shoe mark in males, and also in many females. Hens lay up to twenty eggs in a ground nest. The nest is usually in the margin of a cereal field, most commonly winter wheat. Measurements: [4]
Johnson, J Mangalaraj (1968) Grey Partridge abandoning nest on removal of grass cover over its path to nest. Indian Forester 94:780. Davis, G (1939) On Indian Grey and Black Partridges (Francolinus pondicerianus and Francolinus francolinus). The Avicultural Magazine, 5 4(5):148-151. Gabriel, A (1970) Some observations on the Ceylon Grey Partridge.
The genus Perdix was introduced by the French zoologist Mathurin Jacques Brisson in 1760 with the grey partridge (Perdix perdix) as the type species. [1] [2] The genus name is Latin for "partridge", which is itself derived from Ancient Greek ‘πέρδιξ’ (pérdīx). [3] They are closely related to grouse, koklass, quail and pheasants. [4]
The default color of vertebrate eggs is the white of the calcium carbonate from which the shells are made, but some birds, mainly passerines, produce colored eggs. The pigments biliverdin and its zinc chelate give a green or blue ground color, and protoporphyrin produces reds and browns as a ground color or as spotting.
The vireos and greenlets are a group of small to medium-sized passerine birds mostly restricted to the New World, though a few members of the family, called shrike-babblers, are found in Asia. They are typically greenish in color and resemble wood-warblers apart from their heavier bills White-eyed vireo, Vireo griseus (R)
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The gnatcatchers are mainly a soft bluish gray in color and have the long sharp bill typical of an insectivore. Many species have distinctive black head patterns (especially males) and long, regularly cocked black-and-white tails. One species has been recorded in Connecticut. Blue-gray gnatcatcher, Polioptila caerulea