1. The anal papillae of the sea urchin with a thorn crown looks like devil's eyes.

2. Slender and sharp spines, up to 30 cm long, are poisonous and look terrible.

3. They are large in size and large in number. They come out in the daytime and at night, and when they come out, they are a large area, and their momentum is frightening.

In case of being stung by their sharp spines, it will be as painful as being stung by bees.