Life in the tropics is colourful. Why? I don’t know. Most poisonous things are colourful and others imitate them that might be the reason. There is some truth in that with the warmth and colour of the tropics comes a flip side that can involve disease , violence and lethargy. This is a crinoid or feather star. An animal that looks like a plant but moves and swims. They come in every imaginable colour. I don’t know why. Perhaps just because they can and it’s fun.