Jussi Murtosaari / Grass snake (Natrix natrix) on rock, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) swimming, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) feeding, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) swimming, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) swimming, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Alex Mustard / Portrait of a Clown snake eel (Ophichthus bonaparti) emerging from the seabed. Ambon Bay, Ambon, Maluku Archipelago, Indonesia. Banda Sea, tropical west Pacific Ocean.

Alex Mustard / Portrait of a Clown snake eel (Ophichthus bonaparti) emerging from the seabed. Ambon Bay, Ambon, Maluku Archipelago, Indonesia. Banda Sea, tropical west Pacific Ocean.

Georgette Douwma / Napoleon snake eel (Ophichthus bonaparte) swimming over sand. Lembeh Strait, North Sulawesi, Indonesia.

Pascal Kobeh / Bonapart's / Napoleon snake eel (Ophichthus bonaparti) head sticking out of sand, Sulu Sea, Philippines

Pascal Kobeh / Bonapart's / Napoleon snake eels (Ophichthus bonaparti) heads above sea floor, Sula Sea, Philippines

Georgette Douwma / Napoleon snake eel (Ophychthus bonaparti) out of its burrow, swimming over sandy bottom. Lembeh Strait, North Sulawesi, Indonesia.

Linda Pitkin / Napoleon snake eel (Ophichthus bonaparti) Lembeh Strait, North Sulawesi, Indonesia.