Amano shrimp can change colors depending on their environment and water conditions. There's a member on HFB who has Amano shrimp and they breed profusely in his many ponds. His Amanos are a variety of colors: blue, green, yellow, and orange. Once you move them to a normal aquarium setting, they start to change back to what most of us are used to (transparent with markings). I've always thought they were supposed to be transparent, but was shocked upon finding that they can change colors.