Chaulelasmus streperus, Linn.
961. :- Jerdon's Birds of India, Vol. II, p. 802 ; Butler, Guzerat; Stray Feathers, Vol. IV, p. 27; Deccan, Stray Feathers, Vol. IX, p. 438 ; Murray's Vertebrate Zoology of Sind, p. 293; Game Birds of India, Vol. III, p. 181; Swinhoe and Barnes, Central India; Ibis, Vol. III, p. 137.
Length, 19.4 to 21.5 ; expanse, 33 to 36.75 ; wing, 10.75 to 11.6; tail, 3.9 to 4.3 ; tarsus, 1.4 to 1.5 ; bill from gape, 2 to 2.22 ; weight, 1 7/16 to 2 2/16 lbs.
Length, 18 to 20.1; expanse, 30 to 33.75 ; wing, 9 to 10.2 ; tail, 3.7 to 4.5 ; tarsus, 1.37 to 1.43 ; bill from gape, 1.94 to 2.1; weight, 1 1/16 to 1 10/16 lbs.
Bill brownish-black, tinged reddish beneath ; irides dark-brown; legs yellowish brown to dull orange.
Male, head and neck greyish-white, speckled with brown ; back dark clove-brown, with white crescentic lines; scapulars undulated with white and blackish-brown ; rump and upper tail-coverts glossed with purplish-blue; tail cinereous-brown, edged and tipped with white; lesser wing-coverts grey, mixed with white; median wing-coverts rich brownish-chesnut; greater-coverts glossy black, speculum white above, black beneath ; quills brown; tertials brownish-grey; lower part of the neck and breast dark brown with white crescentic lines; abdomen white, minutely speckled with greyish-brown, and the flanks with brown and white undulations ; lower tail-coverts glossy-black.
The female has the head black mixed with whitish, a pale superciliary streak, the upper parts deep brown, the. feathers edged with buff; the lesser wing-coverts hair-brown, margined paler; the speculum as in the male; the tail marbled with brown and whitish; the chin and throat whitish ; breast pale buff, with brown spots, and the rest of the lower parts white ; the bill paler and the margins reddish.
The female is very like that of the Mallard, but is smaller, and the speculum is white, opposed to the metallic purplish one of the Mallard.
The Gadwall is one of the commonest of the ducks, and occurs during the cold season throughout the district.
It is fairly good eating but not equal to either the Mallard or the Spot-bill.