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

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

David Fleetham / Black-chest shrimp goby (Amblyeleotris guttata) and Blind snapping shrimp (Alpheus ochrostriatus), symbiosis. As pictured here, the shrimp always keeps an antennae touching the goby. Fiji.