There are many native gobies in our country. They have different forms, and their personalities are gentle and irritable. The gobies we see in the wild are basically solitary and particularly sensitive small fish. In fact, it also has alien companions, called "gun shrimp".
Gun shrimp are small in size and have weak eyesight, and although a pair of pliers can resist some small fish, they are actually not very useful. Such a shrimp has nothing else to rely on for survival except hiding in the shadows. When it starts punching holes, few predators will find it. But when it comes out to unload the sand, it is naked and exposed, and it is easy to be spotted by predators.
Gobies are stronger than gun shrimp and have a violent temper. Fights are fierce and often appear next to gun shrimp. It waits for the gun shrimp to dig a hole and then goes in to rest, saving itself the need to find a hole. Gun shrimp who are forced into the old nest live with gobies, but are not attacked by gobies.
Over the long years, gobies and gun shrimp have formed a good mutually beneficial relationship. Gobies live in gun shrimp homes and are responsible for protecting the safety of gun shrimp. Gun shrimp are not as good at hunting as gobies, so they also eat gobies. The cohabitation of the two is a harmonious symbiotic relationship, and the goby needs to find a safe place to live after leaving the gun shrimp. Gun shrimp leaving the goby is not only a threat to life safety, but even the predation is difficult.