What kind of symbiosis is pistol shrimp and goby fish?

The relationship between pistol shrimp and goby fish is a classic example of mutualism.

Here's why:

* The pistol shrimp digs and maintains a burrow in the sand. It's blind and vulnerable to predators when outside the burrow.

* The goby fish has excellent eyesight and can warn the shrimp of danger. The goby also helps keep the burrow clean.

* The goby fish relies on the burrow for protection from predators.

* The shrimp benefits from the goby's warning system and its help with burrow maintenance.

Both species clearly benefit from the relationship, making it a mutually beneficial symbiosis.