Black-ray goby mother bird regurgitating food to her chicks. This way, the shrimp and the goby are kept well fed. Sometimes, if the shrimp is not kept well fed, it will resort to killing the goby. In the wild, most burrows are shared by male and female goby pairs, with their respective shrimp partners, and the female goby will use this burrow as a nesting site to lay her eggs. The obvious benefits to both organisms of this symbiotic relationship make the interaction a form of mutualism. Here is an interesting example of this. The other fish is a dartfish (genus "Ptereleotris").
Bucchich's goby Bucchich's goby Bucchich's goby ("Gobius bucchichi") is a species of goby native to the Eastern Mediterranean Sea and perhaps the Black Sea. It has traditionally been considered to be more widespread, but in 2016 the similar incognito goby ("G. incognitus") was described. It had been confused with the Bucchich's goby and much information formerly published for this species is now considered to actually be for the incognito goby. The Bucchich's goby prefers coastal waters with a sandy or muddy substrate with seagrass patches or tide pools at depths of from . Its diet consists of polychaete worms, amphipods, molluscs and