Of course bird hunting is a different story. Turkeys see colors
and patterns. Deer see the blue end of the spectrum so can see
blue jeans. Shapes are also important and the leafy type camo is
good for big game as well as birds.

Dark colors absorb more light/heat as mentioned and so in a desert
enviro- a sun shade should be made of a dark color and set far above
you to give the best shade while providing and insulating airspace.