Fred Bavendam / Goby (Amblyeleotris sp) keeping watch while a Snapping Shrimp (Alpheus randalli) excavates their shared burrow, Bali, Indonesia

Fred Bavendam / Brown Snapping Shrimp (Alpheus armatus) on coral, Bonaire, Netherland Antilles, Caribbean

David Hall / Yellow prawn-goby (Cryptocentrus cinctus) and Snapping shrimp (Alpheus sp). Mutualistic symbiosis with goby as watchdog and shrimp maintaining burrow. Komodo, Indonesia.

David Hall / Arcfin shrimpgoby (Amblyeleotris arcupinna) and Snapping shrimp (Alpheus sp), blind shrimp maintaining contact with goby via antenna. Mutualism with shrimp maintaining burrow and goby acting as lookou...

Georgette Douwma / Striped snapping shrimp (Synalpheus striatus) (Synalpheus stimpsoni) living on crinoids. West Papua, Indonesia. Indo-West Pacific.

David Fleetham / Steinitz' prawn / shrimp goby (Amblyeleotris steinitzi) and Alpheid worker shrimp (Alpheus sp) side by side. Mutualism occurs between the two species, the blind shrimp maintaining the shared burro...

Constantinos Petrinos / Striped snapping shrimp (Synalpheus striatus) mating pair on host Crinoid. Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Mosaic-fin Shrimp Goby (Flabelligobius sp.) living in association with Red Banded Alpheid Shrimp (Alpheus randalli) Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Yellow-snout shrimp goby (Stonogobiops xanthorhinica) with the symbiotic Red Banded Alpheid Shrimp (Alpheus randalli) Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Snapping shrimp (Alpheus frontalis) on sand. Lembeh Strait, North Sulawesi, Indonesia.

Tony Wu / Snapping shrimp (Alpheus frontalis) infected with a Rhizocephalan parasite, possibly (Thompsonia sp.) Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Stimpson's snapping shrimp (Synalpheus stimpsoni) pair, female with eggs visible through transparent exoskeleton on host Crinoid (Comaster spp.) Lembeh Strait, North Sulawesi, Indonesia.

Pascal Kobeh / Red-banded shrimp (Alpheus randalli) and Pinkbar goby (Amblyeleotris aurora) symbiotic pair with goby protecting shrimp as it digs. Maldives. Indian Ocean.

Franco Banfi / Banded shrimpgoby (Cryptocentrus cinctus) sharing burrow with Alpheus shrimp (Apheus sp) Cendana Jetty, Waigeo island, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Fred Bavendam / Barred Shrimp Goby (Cryptocentrus fasciatus) sharing a burrow with a Snapping Shrimp (Alpheus djiboutensis), Lembeh Strait, Indonesia

Fred Bavendam / Yellow Shrimp Goby (Cryptocentrus cinctus) sharing a burrow with a Snapping Shrimp (Alpheus sp), Menjangan Island, Indonesia

Fred Bavendam / Yasha Hase Shrimp Goby (Stonogobiops yasha) sharing a burrow with a Randall's Shrimp (Alpheus randalli), Coral Sea, Australia

Fred Bavendam / Black-rayed Shrimpgoby (Stonogobiops nematodes) pair sharing a burrow with a Randall's Shrimp (Alpheus randalli), Bali, Indonesia

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

Fred Bavendam / Snapping Shrimp (Alpheus sp), Edithburgh, Australia

Fred Bavendam / Pistol Shrimp (Alpheus bidens), Edithburgh, Australia

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

Gary Bell/ Oceanwide / Candy-stripe Pistol Shrimp (Alpheus astrinx), Yorke Peninsula, South Australia, Australia

David Fleetham / Saffron Shrimpgoby (Ctenogobiops crocineus) living in a symbiotic relationship with a Blind snapping shrimp (Alpheus rapacida) which is excavating their den. The shrimp always keeps an antennae touchi...

Nick Upton / Hooded shrimp (Athanas nitescens) in a rock pool low on the shore, The Gower, Wales, UK, September.

Francisco Marquez / Gunman shrimp (Alpheus) on white background, Islas Marias Archipelago, Marias Biosphere Reserve, Mexico.

Georgette Douwma / Stimpson's snapping shrimp (Synalpheus stimpsoni) in a crinoid. Lembeh Strait, North Sulawesi, Indonesia.

Alex Mustard / Tiny snapping shrimp (Synalpheus sp.) looks out from within sea squirt (Didemnum molle) at night on a coral reef. Piaynemo Island, Raja Ampat, West Papua, Indonesia. Dampier Strait, Tropical West Paci...

Frederique Olivier / Watchman goby (Cryptocentrus cinctus) and alpheid shrimp mutualism, the goby keeps watch while the shrimps dig and clean a shared burrow in the sand, Uepi Island, Solomon Islands.

Frederique Olivier / Watchman goby (Cryptocentrus cinctus) and alpheid shrimp mutualism, the goby keeps watch while the shrimps dig and clean a shared burrow in the sand, Uepi Island, Solomon Islands.

Frederique Olivier / Watchman goby (Cryptocentrus cinctus) and alpheid shrimp mutualism, the goby keeps watch while the shrimps dig and clean a shared burrow in the sand, Uepi Island, Solomon Islands.

Frederique Olivier / Banded prawn goby (Cryptocentrus cinctus) and alpheid shrimp mutualism, the goby keeps watch while the shrimps dig and clean their burrow in the sand, Uepi Island, Solomon Islands.

David Fleetham / Pair of Yellownose shrimp gobies (Stonogobiops xanthorhinica) with Randalls blind snapping shrimp (Alpheus randalli) excavating their den. Fiji.

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.

David Fleetham / Red-banded prawn-goby (Amblyeleotris fasciata) sharing burrow with Shrimp (Alpheus bellulus) Yap, Micronesia.

Constantinos Petrinos / Duplicate snapping shrimp (Alpheus frontalis) on sand. Lembeh Strait, North Sulawesi, Indonesia.