1. Sea pork is inedible.

2. Because the tentacles of sea pigs contain a lot of toxic substances, they will be poisoned if eaten, so they can't be eaten. Sea pigs like to live in groups. When they gather together, they will collectively face one direction, that is, the direction of water flow.

It looks like a sunflower. The life of a porcupine is very fragile, easily attacked by parasites, and it may die if stabbed.