Thanks, Wetwork. Good info.
Color blindness can be determined pretty conclusively and without regard for retinal anatomy. Also, I'd guess we both know that elk and deer can't really see very well to begin with. Sight is their poorest sense by far. They don't really even see shapes. Many, including myself, have been within 25 feet of them, right out in the open, without them seeing us. But holding still is key. They can see movement VERY well. I wear orange when in the woods during hunting season. Because I totally do not trust hunters.
I totally hear you about the carrying part. Seriously. I'm not a big young man. I am a small-ish older gentleman. I'd have to cut an elk into about twenty pieces.