Swamp Francolin

From Frank Finn's The Game Birds of India & Asia (1911):

This species is easily distinguished from most of our partridges by its large size and comparatively long legs; as in the last species, the sexes are alike in plumage, but the cock is easily distinguishable by his spurs. The upper plumage is brown barred with buff, and the outer tail-feathers chestnut, as in the grey partridge; but the throat is bright rust-red, and the rest of the under-parts brown longitudinally streaked with white. The bill is blackish, the eyes dark, and the feet dull red. The cock of this species, which is a little larger than the hen, will measure fifteen inches, though his tail is only a little over four; the wing is more than seven inches, and the shank two-and-a-quarter.

The swamp partridge, as its name implies, has a habitat quite different from our other species, affecting high grass and cane-brakes near the edges of rivers and jheels, though it will come into cultivated ground to feed. It haunts the alluvial plains of the Ganges and Brahmaputra, extending from Pilibhit to the extremity of Assam and Cachar, and even occurs occasionally on the Khasi plateau; but it is not found in the Sundarbans. …

The Sukla Phanta Wildlife Reserve in Nepal represents the western limit of its distribution.