Bence Mate / European rabbits (Oryctolagus cuniculus) fighting each other, Kiskunsag National Park, Hungary. June. Winner, 2019 Cadiz Photo Nature Competition.

John Chan / Two male Southern Pacific rattlesnakes (Crotalus oreganus helleri) fighting during mating season. This behaviour is known as a "combat dance", and is used to determine dominance and the right to mate...

Ingo Arndt / Two Northern elephant seal (Mirounga angustirostris) males fighting for dominance, California, USA

Andy Rouse / Great crested grebe (Podiceps cristatus cristatus) courtship dance, Cardiff, UK, March.

Krijn Trimbos / Great crested grebe (Podiceps cristatus) two in territorial fight, The Netherlands, March.

Cyril Ruoso / Bonobo (Pan paniscus) male and female copulating, Lola ya Bonobo Sanctuary, Democratic Republic of Congo

Ole Jorgen Liodden / Waved albatross (Phoebastria irrorata) pair in courtship display, Espanola, Galapagos Islands. Critically endangered species.

Suzi Eszterhas / Proboscis Monkey (Nasalis larvatus) dominant male, Sabah, Borneo, Malaysia

Markus Varesvuo / Black grouse (Lyrurus tetrix) mating in snow, Utajarvi, Finland, May.

Andy Rouse / Bengal tiger (Panthera tigris tigris) 11 month cubs with mother 'T19 Krishna' in background, Ranthambhore National Park, India.

David Pattyn / Great crested grebe (Podiceps cristatus) pair performing their 'weed dance' in which they take a vertical position in front of each other and offer plant material to each other. The Netherlands. March...

Markus Varesvuo / Black Grouse (Tetrao tetrix) two males fighting, Liminka, Finland, March