cooked crayfish are sometimes moldy green with yellow in places where it has gone bad. before cooked they are orange with whiskers. green is when you should eat it and you should eat it fast or it will dry up and turn yellow.
Red
No they can see color
Brown or red.
brown,orange,red.
black
A crayfish's heart pumps hemolymph (the crayfish equivalent of blood) throughout its body, distributing oxygen and nutrients to its tissues and organs. The heart is a tubular structure located on the dorsal side of the crayfish, above the stomach.
The heart of the crayfish pumps to circulate the blood. The blood flows through the open cavities as there is a minimum of tubing in the crayfish. The circulation of the blood aerates and purifies it.
A frog can ribbet and have different color skin and a crayfish doesn't make sounds
Crayfish live in the water, dragonflies dont. crayfish have pincers & gills, dragonflies dont. Dragonflies have wings, crayfish dont. dragonflies start life a a larvae, crayfish dont.
It becomes oxygenated.
After molting their exoskeleton, crayfish are a deep red colour. Some may be lighter than others.
The difference between an English crayfish and an American crayfish is the English crayfish grows to about 3 inches long. It is red- brown in color. It's claws has a turquois and white blotch on the edge of the claw. The American crayfish grows to about 6 inches long. This crayfish is much larger and it's claws are red underneath.