832-379382 - Black grouse, also blackgame or blackcock (Lyrurus tetrix) courting male, Hedmark, Norway, Europe

832-379385 - Black grouse, also blackgame or blackcock (Lyrurus tetrix) courting male, Hedmark, Norway, Europe

832-378947 - Bee-eater (Merops apiaster), couple with bridal present, Saxony-Anhalt, Germany, Europe

746-88442 - Wandering Albatross (Diomendea exulans) in courtship behaviour, Island of South Georgia

832-370975 - Farmland Green Tree Frog (Rhacophorus arvalis), inflated vocal sac, courtship display, species endemic to Taiwan, Asia

832-372946 - Natterjack toad (Bufo calamita), male calling, Thuringia, Germany, Europe

832-374888 - King penguins (Aptenodytes patagonicus), St. Andrews Bay, South Georgia, sub-Antarctic and Antarctic

832-372948 - Natterjack toad (Bufo calamita), male calling, Thuringia, Germany, Europe

832-374474 - Kori Bustard (Ardeotis kori), male, in courtship display in Ndutu, Ngorongoro, Tanzania, Africa

832-370977 - Farmland Green Tree Frog (Rhacophorus arvalis), inflated vocal sac, courtship display, species endemic to Taiwan

832-367792 - Great Egret or Great White Egret (Casmerodius albus, Egretta alba), displaying on the nest, Florida, USA

832-374891 - King penguins (Aptenodytes patagonicus), pair in courtship, Gold Harbour, South Georgia, Antarctica

832-370976 - Farmland Green Tree Frog (Rhacophorus arvalis), inflated vocal sac, courtship display, species endemic to Taiwan, Asia

832-372947 - Natterjack toad (Bufo calamita), male calling, Thuringia, Germany, Europe

832-269969 - Fighting Pheasants (Phasianus colchicus) on a cornfield during mating time

832-269968 - Common Pheasants (Phasianus colchicus) on a cornfield during mating time

869-3602 - gelada baboon portrait male baboon displaying its teeth and gums with lip flipped back threat display Simien Mountains National Park Ethiopia Africa Animals

869-895 - Alaskan brown bear animals close-up of bear showing teeth threat display behaviour danger

832-19191 - Moor frog (Rana arvalis)

832-19192 - Moor frog (Rana arvalis)

832-19193 - Moor frog (Rana arvalis)

1198-258 - Magnificent frigatebird (fregata magnificens) in flight with inflated gular pouch, galapagos islands, ecuador

930-47 - Two juvenile Bottlenose dolphins (Tursiops truncatus) showing teeth in socialising display, Moray Firth, Scotland.

908-176 - Cuttlefish (Sepia officinalis) Courtship. Babbacombe, Torquay, South Devon, UK. (A4 only).

908-181 - Cuttlefish (Sepia officinalis) Two in courtship, being photographed by diver. Babbacombe, Torquay, South Devon, UK (RR)

908-178 - Cuttlefishes (Sepia officinalis) Mating. Babbacombe, Torquay, South Devon, UK (RR)

909-218 - Two displaying Chinstrap Penguins (Pygoscelis antarcticus). Livingston Island, Antarctica

909-225 - King Penguin (Aptenodytes patagonicus) teenagers starting to display. Salisbury Plain, South Georgia, Subantarctic

1036-78 - Killer whale (Orcinus orca) Mother slapping her tail flukes near her calf with snowy mountains behind. Mid-winter in Tysfjord, Norway

1067-50 - 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.

1067-28 - 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

931-393 - Magnificent frigat bird (fregata magnificens ) A male frigate bird displaying his pouch. Gulf of California.

917-413 - Dalls Porpoise (Phocoenoides dalli) adult surfacing at great speed. Monterey, California, Pacific Ocean. MORE INFO: Displaying characteristic spray of water known as a rooster tail.

995-606 - Robin (Erithacus rubecula) displaying with rival on a mossy wall. Loch Awe, nr Oban, Scotland, UK

979-5996 - Lava lizard (Microlophus spp) in the Galapagos Island Archipeligo, Ecuador. Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-3418 - Lava lizard (Microlophus spp) in the Galapagos Island Archipeligo. Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-2624 - Adult Great Egret (Ardea alba) in courtship display near San Jose del Cabo, Baja California Sur, Mexico.

979-5998 - Lava lizard (Microlophus spp) in the Galapagos Island Archipeligo, Ecuador. Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-6295 - Blue-footed booby (Sula nebouxii) in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

979-5754 - Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean

979-1194 - Antarctic Fur Seal (Arctocephalus gazella) pups playing at Stromness Whaling Station on the island of South Georgia, southern Atlantic Ocean.

979-3419 - Lava lizard (Microlophus spp) in the Galapagos Island Archipeligo. Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-1774 - Black-browed Albatross (Thalassarche melanophrys) adult courtship dance in the Falkland Islands.

979-1901 - Sub-Antarctic Skua (Catharacta antarctica) displaying aggression after a fight for a fish head on Barrentos Island in the Aitcho Island Group, south Shetland Islands, Antarctica.

979-5758 - Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean

979-6285 - Blue-footed booby (Sula nebouxii) in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

979-5761 - Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador

979-1225 - Two young California Sea Lion bulls (Zalophus californianus) mock-fighting in the Gulf of California (Sea of Cortez), Mexico.

979-5759 - Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador

979-2629 - Adult Great Egret (Ardea alba) in courtship display near San Jose del Cabo, Baja California Sur, Mexico.

979-410 - Adult bull California Gray Whale (Eschrichtius robustus) penis display (courtship behaviour) in the calm waters of San Ignacio Lagoon, Baja, Mexico. (Restricted Resolution - pls contact us)

979-2623 - Adult Great Egret (Ardea alba) in courtship display near San Jose del Cabo, Baja California Sur, Mexico.

979-2626 - Adult Great Egret (Ardea alba) in courtship display near San Jose del Cabo, Baja California Sur, Mexico.

979-2622 - Adult Great Egret (Ardea alba) in courtship display near San Jose del Cabo, Baja California Sur, Mexico.

979-2628 - Adult Great Egret (Ardea alba) in courtship display near San Jose del Cabo, Baja California Sur, Mexico.

979-5757 - Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador

979-1783 - Black-browed Albatross (Thalassarche melanophrys) mating ritual in the Falkland Islands.

979-3415 - Lava lizard (Microlophus spp) in the Galapagos Island Archipeligo. Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-5762 - Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador

979-6162 - Brown pelican (Pelecanus occidentalis) in the Gulf of California (Sea of Cortez), Baja California Norte, Mexico.

979-9295 - Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island in the Southern Ocean

979-9297 - Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island in the Southern Ocean

979-1772 - Black-browed Albatross (Thalassarche melanophrys) adult courtship dance in the Falkland Islands.

979-3417 - Lava lizard (Microlophus spp) in the Galapagos Island Archipeligo. Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-3416 - Lava lizard (Microlophus spp) in the Galapagos Island Archipeligo. Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-2627 - Adult Great Egret (Ardea alba) in courtship display near San Jose del Cabo, Baja California Sur, Mexico.

979-2620 - Adult Great Egret (Ardea alba) in courtship display near San Jose del Cabo, Baja California Sur, Mexico.

979-3252 - Male great frigate bird (Fregata minor) displaying to each other on nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean

979-5763 - Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador

979-1773 - Black-browed Albatross (Thalassarche melanophrys) adult courtship dance in the Falkland Islands.

979-2625 - Adult Great Egret (Ardea alba) in courtship display near San Jose del Cabo, Baja California Sur, Mexico.

979-5993 - Photographer taking an image of a lava lizard (Microlophus spp) in the Galapagos Island Archipelago, Ecuador

979-5991 - Lava lizard (Microlophus spp) on a trail marker in the Galapagos Island Archipeligo, Ecuador. MORE INFO: Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-9251 - Great frigatebird (Fregata minor) chick in the nest in the Galapagos Island Archipelago, Ecuador

979-9252 - Male great frigatebird (Fregata minor) in breeding plumage in the Galapagos Island Archipelago, Ecuador

979-6165 - Brown pelican (Pelecanus occidentalis) in the Gulf of California (Sea of Cortez), Baja California Norte, Mexico.

979-1777 - Black-browed Albatross (Thalassarche melanophrys) adult courtship dance in the Falkland Islands.

979-3420 - Lava lizard (Microlophus spp) in the Galapagos Island Archipeligo. Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-5756 - Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador

979-2621 - Adult Great Egret (Ardea alba) in courtship display near San Jose del Cabo, Baja California Sur, Mexico.

979-3422 - Lava lizard (Microlophus spp) in the Galapagos Island Archipeligo. Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-5999 - Lava lizard (Microlophus spp) in the Galapagos Island Archipeligo, Ecuador. Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-6294 - Blue-footed booby (Sula nebouxii) in ritualistic courtship display in the Galapagos Island Group, Ecuador. MORE INFO: The Galapagos are a nesting and breeding area for blue-footed boobies.

979-6296 - Blue-footed booby (Sula nebouxii) in ritualistic courtship display in the Galapagos Island Group, Ecuador. MORE INFO: The Galapagos are a nesting and breeding area for blue-footed boobies.

979-6293 - Blue-footed booby (Sula nebouxii) in ritualistic courtship display in the Galapagos Island Group, Ecuador. MORE INFO: The Galapagos are a nesting and breeding area for blue-footed boobies.

979-5760 - Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador

979-3421 - Lava lizard (Microlophus spp) in the Galapagos Island Archipeligo. Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

979-1775 - Black-browed Albatross (Thalassarche melanophrys) adult courtship dance in the Falkland Islands.

832-8246 - Wild Turkey (Meleagris gallopavo), male displaying, Corpus Christi, Texas, USA

832-7904 - Painted Bunting (Passerina ciris), male displaying, Sinton, Corpus Christi, Coastal Bend, Texas, USA

832-8356 - Lesser Prairie-Chicken (Tympanuchus pallidicinctus), male displaying in prairie, vocal sac inflated, Canadian, Panhandle, Texas, USA

832-8924 - Lesser Prairie-Chicken (Tympanuchus pallidicinctus), males displaying, Panhandle, North Texas, USA

832-8699 - Wild Turkey (Meleagris gallopavo), male displaying, Lake Corpus Christi, South Texas, USA

832-22557 - Black-browed Albatrosses or Black-browed Mollymawks (Diomedea melanophris), Falkland Islands, South America

832-25041 - Hyacinth Macaw (Anodorhynchus hyacinthinus), adult, pair, courtship display, native to South America

832-22679 - Black grouse (Lyrurus tetrix, Tetrao tetrix), courting in a snow-covered moor, Sweden, Scandinavia, Europe

832-24441 - Northern Gannets (Morus bassanus, Sula bassana), in spring, mating season, ocean island, Helgoland, Schleswig-Holstein, Germany, Europe

832-17353 - Tree frog (Rhacophorus arvalis), inflated vocal sac, courtship, endangered species, Taiwan, Asia

832-10167 - Magnificent fregate bird (Fregata magnificens) sitting on brushwood and mating with bloated throat pouch, Genovesa Island, Tower Island, Galápagos Archipelago, Ecuador, South America

832-15758 - Black Grouse or Blackgame (Lyrurus tetrix), courting cock