Sam Hobson / Common toads (Bufo bufo) in amplexus, Bristol, UK, March.
Tui De Roy / Erect-crested penguin (Eudyptes sclateri) pair in greeting display. Antipodes Island, New Zealand Sub-Antarctic Islands. Endemic to Antipodes and Bounty Islands. Endangered species.
Tui De Roy / Little blue / fairy penguin (Eudyptula minor) pair courting near nesting burrow, Neck Game Reserve, Bruny Island, Tasmania, Australia, December.
Marie Read / Royal terns (Sterna maxima) pair crossing bills during courtship behaviour, Fort DeSoto Park, Florida, USA
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...
Sven Zacek / Two Roe deer (Capreolus capreolus) sniffing each other in the snow, Vorumaa, Estonia, January. Winner of the Animal stories portfolio in the Melvita Nature Images Awards competition 2014.
Michael D. Kern / Two Dyeing dart frogs (Dendrobates tinctorius) against background, captive occurs in Guyana, Suriname, Brazil, and French Guiana. Available for on-line use only.
Jack Dykinga / Rain spattered inter-locking palm leaves create a design of pattern and colour in the tropical rainforest. Osa Peninsula, Costa Rica
Ben Cranke,Ben Cranke / Gentoo Penguin (Pygoscelis papua) penguins rest on a floating iceberg, Antarctic Peninsula, Antarctica
Andrew Parkinson / Gannet (Morus bassanus) breeding pair during part of their elaborate courtship ritual. Saltee Islands, Republic of Ireland, May.
Ben Hall,Ben Hall / Great crested grebes (Podiceps cristatus) pair performing courtship displaying, Cheshire, UK, March
Ben Hall / Great crested grebe (Podiceps cristatus) pair performing courtship display at dawn, backlit with surrounding by mist, Cheshire, UK, March
Anup Shah / Lion (Panthera leo) male nuzzling lioness, Masai Mara National Reserve, Kenya, July
Michael Pitts / Green sea turtles (Chelonia mydas) mating turtles. Karan Island, Arabian Gulf.
Diane McAllister / A wild newborn colt (Equus caballus) standing up being nuzzled by its mother. Foothills of Reno, Nevada, USA, May.
Mark Bowler / Line of Leaf-cutter ants (Atta sp) carrying leaves, digital composite
Edwin Giesbers / RF- Northern gannet (Morus bassanus) pair, Heligoland, Germany. April. (This image may be licensed either as rights managed or royalty free.)
Edwin Giesbers / RF- Gentoo Penguin (Pygoscelis papua) chick begging parent for food, Antarctica. (This image may be licensed either as rights managed or royalty free.)
Philip Stephen / Fishing vessel 'Devotion' trawling for Monkfish west of the Shetland Isles, Scotland, UK, March 2016.
Denis-Huot / RF- Masai giraffe (Giraffa camelopardalis tippelskirchi) pair at sunrise. Masai-Mara Game Reserve, Kenya. (This image may be licensed either as rights managed or royalty free.)
Carol Walker / Head portrait of black Andalusian stallion and mare meeting for the first time in southern Spain, Europe.
Carol Walker / RF - Head portrait of black Andalusian mare and stallion meeting for the first time in Spain, Europe. (This image may be licensed either as rights managed or royalty free.)
Alex Hyde / RF - Yellow-flecked Glassfrogs (Sachatamia albomaculata) pair in amplexus. Osa Peninsula, Costa Rica. (This image may be licensed either as rights managed or royalty free.)
Andy Rouse / RF- Great crested grebe (Podiceps cristatus cristatus) courtship dance, Cardiff, UK, March. (This image may be licensed either as rights managed or royalty free.)
Andy Rouse / Great crested grebe (Podiceps cristatus cristatus) courtship dance at dawn, Cardiff, UK, March.
Enrique Lopez-Tapia / Christian woman praying, Bet Danaghel (part of the northwestern group of churches in Lalibela). UNESCO World Heritage Site. Lalibela. Ethiopia, December 2014.
Denis-Huot / RF- Asian elephants (Elephas maximus) greeting each other, Kaziranga National Park, Assam, India. (This image may be licensed either as rights managed or royalty free.)
Kim Taylor / Leaf-cutter ants (Atta cephalotes) on white background, carrying leaf sections and flower heads. Tobago, West Indies. Digital Composite.
Wild Wonders of Europe / Widstrand / Exmoor ponies, one of the oldest and most primitive horse breeds in Europe, Keent Nature Reserve, The Netherlands, September.
Diane McAllister / Young Japanese macaque (Macaca fuscata) 'kissing' another macque in the thermal hot springs, Jigokudani, Japan, January
Denis-Huot / RF- Cheetah (Acinonyx jubatus) two brothers cleaning each other, Masai-Mara Game Reserve, Kenya. Vulnerable species. (This image may be licensed either as rights managed or royalty free.)
George Sanker / Mature Bighorn Rams (Ovis canadensis) on high mountain pass. Jasper National Park, Alberta, Canada, October.
Carol Walker / RF- Quarter horse, sorrel mare and foals. Double Diamond ranch, Nebraska, USA. July. (This image may be licensed either as rights managed or royalty free.)