Rouen duck breast. The female Rouen hens are a consistent shade of mahogany brown, with a brown crown and tan eye-stripes extending from bill to the back of the eyes. Another feature of the female color pattern is the distinct, detailed penciling found on feathers of the head, neck, body, body, most of the wing and tail. Rouen females can be much darker brown than Mallard females. Both sexes also have blue speculum feathers. However, Rouen speculum feathers are brighter in color and larger in size than that of the Mallard. Adult Rouen ducks are typically significantly larger than Mallard ducks. The
Khaki United States Army adopted khaki during the Spanish–American War (1898), replacing their traditional blue field uniforms. The United States Navy and United States Marine Corps followed suit, authorizing khaki field and work uniforms. When khaki was adopted for the continental British Service Dress in 1902, the shade chosen had a clearly darker and more green hue. This color was adopted with minor variations by all the British Empire Armies and the US expeditionary force of World War I, in the latter under the name olive drab. This shade of brown-green remained in use by many countries throughout the two World