Jordi Chias / Jellyfish (Diplulmaris antarctica). Cuverville, Antarctic Peninsula, Antarctica.

Alex Mustard / Lion's mane jellyfish (Cyanea capillata) with feeding tentacles spread swimming in the sun in shallow water. Gulen, Norway. North East Atlantic Ocean.

Alex Mustard / Aggregation of Golden jellyfish (Mastigias sp.) in a marine lake in Palau, the golden colour of this species comes from symbiotic algae in its tissues. Jellyfish Lake, Eil Malk island, Rock Islands, P...

Luis Quinta / Moon jellyfish (Aurelia aurita) near the surface, Santa Maria Island, Azores, September.

SCOTLAND: The Big Picture / Mauve stinger (Pelagia noctiluca) at the entrance of a cave, Sula Sgeir, Outer Hebrides / Western Isles, Scotland, July.

Alex Mustard / Aggregation of Golden jellyfish (Mastigias sp.) in a marine lake in Palau, the golden colour of this species comes from symbiotic algae in its tissues. Jellyfish Lake, Eil Malk island, Rock Islands, P...

Suzi Eszterhas / Black sea nettle (Chrysaora achlyos) captive in Monterey Bay Aquarium, California, USA, October.

Suzi Eszterhas / Purple-striped jellyfish (Chrysaora colorata) captive, USA, January.

Suzi Eszterhas / Crown jelly (Cephea cephea) captive, Monterey Bay Aquarium, California, USA, January.

Pascal Kobeh / Woman swimming in a marine lake among thousands of Golden jellyfish (Mastigias papua etpisoni), subspecies of the spotted jellyfish living in the nearby lagoons. Eil Malk island, Koror, Palau. Philip...

Pascal Kobeh / Woman swimming in a marine lake among thousands of Golden jellyfish (Mastigias papua etpisoni), subspecies of the spotted jellyfish living in the nearby lagoons. Eil Malk island, Koror, Palau. Philip...

Pascal Kobeh / Woman swimming in a marine lake among thousands of Golden jellyfish (Mastigias papua etpisoni), subspecies of the spotted jellyfish living in the nearby lagoons. Eil Malk island, Koror, Palau. Philip...