The different colors of brown/tan that raptors can be seen in. Each color may vary slightly in shades. Every color produces what color it is plus whatever is provided for that specific color.
Left to right top to bottom.
Tumbleweed
-- rare
-- tan with a pink tint
-- can produce any common, sand, dust, and chestnut
Dust
-- rare
-- tan with gray tint
-- produces chestnut, walnut, cedar, and treebark
Chestnut
-- uncommon
-- a darker dust with a more orange/red tint
-- produces any common, tawny, clay, and tumbleweed
Mauve
-- very rare
-- tan with purple tint
-- produces cedar and hickory. When paired with a blue produces blueberry
Mud
-- common
-- mute brown with red undertone
-- produces commons and chestnut
Sepia
-- common
-- light brown with red
-- produces tawny, copper, clay, and hickory
Walnut
-- common
-- soft brown with gray tint
-- produces common, dust, chestnut, and treebark
Cedar
-- common
-- dark brown with gray tint
-- produces common, dust, chestnut, treebark, and mauve
Hickory
-- common
-- dark brown with red tint
-- produces common, tawny, copper, clay, and tumbleweed