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

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

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

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

Ammonite / African lioness (Panthera leo) growling and swatting at a sub-adult male approaching a kill, footage taken at night using thermal camera technology, Masai Mara, Kenya.

Jabruson Motion / Small group of African forest elephants (Loxodonta africana cuclotis) running into forest clearing, trumpeting to dominant male feeding and cooling down in a mineral pool, Dzanga Bai, Dzanga-Ndoki Nat...

Laurent Geslin / Two male urban Red foxes, territorial posture at junction of territories {Vulpes vulpes} London, UK

Laurent Geslin / Two male urban Red foxes, mouths open, one in submissive posture {Vulpes vulpes} London, UK