Andy Rouse / Male Bengal tiger (Panthera tigris tigris) rolling, part of mating routine, Ranthambore, India.
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John Chan / Male Anna's hummingbird (Calypte anna) taking off and landing, defending its territory from intruders, Southern California, USA, March.
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John Chan / Elegant tern (Thalasseus elegans) displaying, establishing territory, Southern California, USA, April.
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John Chan / Male Allen's hummingbird (Selasphorus sasin) surveying territory from perch, Southern California, USA, March.
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Vishal Jadhav / Great hornbill (Buceros bicornis) female vocalising at the top of the canopy, Maharashtra, India, May.
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Lewis Jefferies / Black-hooded antshrike (Thamnophilus bridgesi) male vocalising, Merino Bellena National Park, Costa rica, February.
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Vishal Jadhav / Dhole (Cuon alpinus) breeding male urinates on scat whilst group walks forward, Maharashtra, India, Jaunary.
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Brian Bevan / Wren (Troglodytes troglodytes) singing, Northamptonshire, UK, May.
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Brian Bevan / Whitethroat (Sylvia communis) singing from hedgerow, Bedfordshire, UK, May.
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Brian Bevan / Nightingale (Luscinia megarhynchos) singing from cover, Bedfordshire, UK, May.
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Brian Bevan / Nightingale (Luscinia megarhynchos) singing from elderberry bush, Bedfordshire, UK, May.
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Bruce Thomson / Estuarine / Saltwater crocodile (Crocodylus porosus) swimming towards another crocodile, it displays aggressive territorial behaviour causing its rival to swim away in a large freshwater billabong, Au...
