Courtship Display of Cuttlefish, Sepia sp., Ambon, Moluccas, Indonesia

Courtship Display of Cuttlefish, Sepia sp., Ambon, Moluccas, Indonesia

Mating display by pair of Wire-net filefish (Cantherhines paradalis), Queensland, Australia, Pacific

Courtship Display of Cuttlefish, Sepia sp., Ambon, Moluccas, Indonesia

Shark in Aquarium of San Sebastian, Bay of Biscay, province of Gipuzkoa, Basque Country, Spain, Europe

Juvenile humpback whale (Megaptera novaeangliae) breaching near the Antarctic Peninsula, Antarctica, Polar Regions

Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean

Young adult bull southern elephant seal (Mirounga leonina) holding young pup's head underwater trying to kill it, South Georgia Island, Southern Ocean

Adult broadclub cuttlefish (Sepia latimanus) courtship display, Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

An orangethroat pike blenny (Chaenopsis alepidota), displays its colors in hopes of attracting a mate, Sea of Cortez.

Curious walrus (Odobenus rosmarus rosmarus) near Apollo Island in Franz Josef Land, Russia, Arctic Ocean, Eurasia

Aquarium of Genoa, Liguria, Italy, Europe

Mimic octopus (Octopus sp.). Indo Pacific

Red Firefish (Pterois volitans). Indo Pacific

Mimic octopus (Octopus sp.). Indo Pacific

Sperm Whale, Physeter macrocephalus, imature male, penis display underwater in the northern Gulf of California, Mexico

Wunderpus (Wunderpus photogenicus) showing off its bands to scare off predator (or diver). Lembeh Strait, Sulawesi, Indonesia

Butter hamlets mating at sunset, Cayman Islands

Zebra lionfish (Dendrochirus zebra) Adult animal displaying colo Gangga Island North Sulawesi Indonesia Pacific Ocean. More info: Like all lionfish this species has toxins associated with its dorsal and pectoral

Featherduster Worm (Sabellastarte sanctijosephi),beautiful fan at full stretch with dark blue background, Seychelles.

Red Firefish (Pterois volitans). Indo Pacific

Spot fin goby (or crab-eyed goby) (Signigobius biocellatus). Indo Pacific

Cuttlefishes (Sepia officinalis) Mating. Babbacombe, Torquay, South Devon, UK (RR)

Mimic octopus (Octopus sp.). Indo Pacific

Mushroom coral, Fungia sp., displaying fluorescence. Some corals have pigments which fluoresce under UV or blue wavelengths of light. Lembeh Strait, North Sulawesi, Indonesia, Pacific Ocean.

Zebra lionfish (Dendrochirus zebra). Indo Pacific

Cuttlefish (Sepia officinalis) Courtship. Babbacombe, Torquay, South Devon, UK. (A4 only).

Zebra lionfish (Dendrochirus zebra). Indo Pacific

Cuttlefish (Sepia officinalis) Two in courtship, being photographed by diver. Babbacombe, Torquay, South Devon, UK (RR)

Feather worm.

Pygmy (?) Lionfish (Pterois sp. ?). Papua New Guinea

Male Bluegill Triggerfish (Xanthichthys auromarginatus) with an erect spinous dorsal fin photographed under water off Maui, Hawaii, USA. He was circling above his prepared spawning area suggesting that this is a courtship display; Maui, Hawaii, United States of America

Honeycomb Cowfish Courtship display, Lactophrys polygonia, Cozumel, Caribbean Sea, Mexico

Honeycomb Cowfish Courtship display, Lactophrys polygonia, Cozumel, Caribbean Sea, Mexico

Honeycomb Cowfish Courtship display, Lactophrys polygonia, Cozumel, Caribbean Sea, Mexico