Remi Masson / Great blue spotted mudskipper (Boleophthalmus pectinirostris), two males in territorial fight. On mud at low tide, Kyushu Island, Japan. August.

Remi Masson / Great blue spotted mudskipper (Boleophthalmus pectinirostris) in burrow with another mudskipper above. Kyushu Island, Japan. August.

Remi Masson / Great blue spotted mudskipper (Boleophthalmus pectinirostris), two in territorial fight on mudflat. Kyushu Island, Japan. August.

David Fleetham / Slender spongegoby (Phyllogobius platycephalops) and two Crabs of different species on Sponge. Several parasites with egg cases on the side of the Goby. Philippines.

Sue Daly / Two-spot gobies (Gobiusculus flavescens), Sark, British Channel Islands, UK, June.

Sue Daly / Two-spot goby (Gobiusculus flavescens), Sark, British Channel Islands, UK, June.

Alex Mustard / Two-spot gobies (Gobiusculus flavescens) school swims over Kelp (Laminaria sp). Porthkerris, Lizard Peninsular, Cornwall, UK, August

Graham Eaton / Two-spotted Goby (Gobiusculus flavescens) amongst seaweed, Cardigan Bay, Wales, UK, August

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

Ch'ien Lee / Gold-spotted Mudskipper (Periophthalmus chrysospilos) pair, Bako National Park, Sarawak, Borneo, Malaysia

Remi Masson / Great blue spotted mudskipper (Boleophthalmus pectinirostris), two males in territorial dispute. On mud at low tide, Kyushu Island, Japan. August.