Anup Shah / Hippos courting {Hippopotamus amphibius} Masai Mara NR, Kenya.

David Pattyn / Pair of Great crested grebes (Podiceps cristatus) performing courtship dance, The Netherlands, Europe. March.

David Pattyn / Pair of Great crested grebes (Podiceps cristatus) courtship dance display, The Netherlands, Europe. March.

Mateusz Piesiak / Great-crested grebe (Podiceps cristatus) pair courtship display, Lower Silesia, Poland.

Claudio Contreras / Caribbean flamingo (Phoenicopterus ruber) courtship display, Ria Celestun Biosphere Reserve, Yucatan Peninsula, Mexico, January. Bookplate.

Markus Varesvuo / Two male Black grouse (Tetrao / Lyrurus tetrix) fighting at lek. Utajarvi, Finland, April.

Claudio Contreras / Caribbean flamingos (Phoenicopterus ruber) courtship display, Ria Celestun Biosphere Reserve, Yucatan Peninsula, Mexico, January

George Sanker / Elk (Cervus canadensis) bull and cow sniffing noses, Yellowstone National Park, Wyoming, USA. September.

Will Burrard-Lucas / A mating pair of leopards (Panthera pardus) caught in front of a camera trap at night, Laikipia Wilderness Camp, Kenya. Communication Arts Annual 62 Competition 2021 Winner Book Category; Sony World P...

Tony Heald / Red Deer (Cervus elaphus) stags fighting during the rutting season. Bushy Park, London, UK. October.

Doug Perrine / Black-footed albatross (Phoebastria nigripes) pair at sunset. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine National Monument, Northwest Hawaiian Islands, USA.

Sven Zacek / Black Grouse (Tetrao tetrix) two males facing off on a lekking site, Varumaa county, Southern Estonia. April.

Guy Edwardes / Red-crowned crane (Grus japonensis) courtship dance in snow, Hokkaido, Japan

John Shaw / Black-browed albatross pair (Thalassarche melanophris) mutual grooming during copulation. New Island, Falkland Islands, November.

John Shaw / Great frigatebird (Fregata minor) male at nest site, with gular sac inflated to attract females. Genovesa Island, Galapagos, May.

SCOTLAND: The Big Picture / RF - Brown hare, (Lepus europaeus) male pursuing female that is in season, Islay, Scotland, UK., March (This image may be licensed either as rights managed or royalty free.)

SCOTLAND: The Big Picture / RF - Brown hare, (Lepus europaeus), male and female displaying courtship behaviour, Islay, Scotland, UK., March (This image may be licensed either as rights managed or royalty free.)

SCOTLAND: The Big Picture / RF - Black Grouse (Tetrao tetrix), two males fighting on lek , Scotland, UK.April (This image may be licensed either as rights managed or royalty free.)

SCOTLAND: The Big Picture / Brown hare, (Lepus europaeus), group of animals in field, Islay, Scotland, UK., March

Marie Read / Western Grebe (Aechmorphus occidentalis), pair during 'rushing' courtship display in which they run across water's surface in synchrony, near Escondido, California, USA, January.

Oscar Dewhurst / Red deer (Cervus elaphus) stag roaring, silhouetted under trees at sunrise. Bushy Park, London, UK. September

Bernard Castelein / Sarus crane (Grus antigone), male displaying, Keoladeo NP, Bharatpur, India

Nick Upton / White stork (Ciconia ciconia) pair performing an up-down display with bill clattering on their nest in an Oak tree, Knepp estate, Sussex, UK, April 2019. This is the first recorded instance of White s...

David Pattyn / Great crested grebe (Podiceps cristatus) adults courting and greeting each other to confirm their bond. Even with the young chicks already out they often show courtship behavior to each other, Valkenh...

Russell Cooper / Mandarin duck drake (Aix galericulata) on the water, showing orange 'sail' feathers which are used when displaying, Southwest London, UK, March.

Stefan Christmann / Adelie penguin (Pygoscelis adeliae) calling during courtship, Atka Bay, Queen Maud Land, Antarctica, December.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) pair in courtship, on sea ice. Atka Bay, Antarctica. May.

Shane Gross / Nurse sharks (Ginglymostoma cirratum) two in a courtship dance at sunrise in a mangrove area near Eleuthera, Bahamas.

Paul Hobson / Red deer (Cervus elaphus) herd during rut in morning light. Derbyshire, England, UK. October.

Eric Baccega / Lioness (Panthera leo), aggressively rebuffing male lion banks of the Luangwa river, South Luangwa National Park, Zambia

Franco Banfi / Sperm whale (Physeter macrocephalus) young male trying to copulate with a female. The calf of the female was in the way so the male is trying to chase it away. Dominica.

Wim van den Heever / King penguins (Aptenodytes patagonicus) at sunrise. Two males and a female, with the males fighting for the attention of the female. Falklands Islands. 2018 Wildlife Photographer of the Year LUMIX Peo...

Tui De Roy / Blue-footed booby (Sula nebouxii), pair in courtship display. Punta Pitt, San Cristobal Island, Galapagos. April 2017.

Alex Mustard / Yellowtail tang (Zebrasoma xanthurum) male courting a female prior to spawning at dusk on a coral reef. Temple, Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea.

Steven David Miller / Great bowerbird (Chlamydera nuchalis), male showing off treasures whilst female inspects bower. Lake Argyle, Kununurra, Western Australia.