Juergen Freund / Flagtail shrimp goby (Amblyeleotris yanoi) and shrimp (Alpheus randalli), Bali, Indonesia.

Juergen Freund / Steinitz' shrimp goby (Amblyeleotris steinitzi) with parasitic nudibranch (Gymnodoris nigricolor) feeding on its dorsal fin, the goby lives in symbiosis with the shrimp who digs a burrow which the gob...

Juergen Freund / Steinitz' shrimp goby (Amblyeleotris steinitzi) with parasitic nudibranch (Gymnodoris nigricolor) feeding on its dorsal fin, the goby lives in symbiosis with a shrimp who digs a burrow which the goby...

Fred Bavendam / Filament Dartfish (Ptereleotris hanae) emerging from the burrow of Steinitz' Shrimp Goby (Amblyeleotris steinitzi) and Snapping Shrimp (Alpheus sp), Bali, Indonesia

Fred Bavendam / Metallic Shrimp-goby (Amblyeleotris latifasciata) keeps watch while its Snapping Shrimp (Alpheus sp) partner works on their burrow, Bali, Indonesia

Doug Perrine / Randall's shrimp goby {Amblyeleotris randalli} shares burrow with blind Shrimp {Alpheus sp} which it provides protection to, symbiosis, Kimbe Bay, Papua New Guinea

Doug Perrine / Shrimp {Alpheus ochrostriatus} digging burrow beside symbiotic goby {Amblyeleotris wheeleri} which acts as its 'watchdog' as shrimp is almost blind, Bali, Indonesia

GEORGETTE DOUWMA / Burgundy shrimp goby {Amblyeleotris whelleri} guarding burrowing shrimp, Bunaken, Sulawesi, Indonesia

GEORGETTE DOUWMA / Burgundy shrimp goby {Amblyeleotris whelleri} with shrimp, Sulawesi Indonesia

Chris Newbert / Spotted Prawn Goby (Amblyeleotris guttata) portrait 40 feet deep, Solomon Islands

Fred Bavendam / Spotted Prawn Goby (Amblyeleotris guttata) sharing a burrow with a Find-striped Snapping Shrimp (Alpheus ochrostriatus), Bali, Indonesia

Fred Bavendam / Metallic Shrimp-goby (Amblyeleotris latifasciata) keeping watch while a Snapping Shrimp (Alpheus sp) works on their shared burrow, Bali, Indonesia