Marie Read / Arctic terns (Sterna paradisaea), two in flight over nesting colony in field of buttercups (Ranunculus sp.), Keflavik, Iceland. Digital canvas expansion.

Nick Upton / Eurasian beaver (Castor fiber) feeding on grass amongst Meadow buttercups (Ranunculus acris) near a pond in a large enclosure, Devon, England, UK, June. Captive.

Roland Seitre / Przewalski's horse (Equus ferus przewalskii) grazing in buttercups, Parc de la Haute Touche, Obterre, France. May. Captive, occurs in Central Asia.

Andrew Parkinson / Red Fox (Vulpes vulpes) in meadow of buttercups. Derbyshire, UK, June. British Wildlife Photographer of the Year (BWPA) competition 2012, 'Outdoor Photography editor's choice' category. (Non-ex)

Sandra Bartocha / Common Hepatica (Anenome hepatica) Stadtkreis Neubrandenburg, Mecklenburg-Vorpommern, Germany, March

Sandra Bartocha / Common Hepatica (Anenome hepatica) flowers, Mecklenburg-Vorpommern, Germay, April

Colin Varndell / Male Common pheasant ( Phasianus colchicus) in meadow full of buttercups, Dorset, UK, June

Wild Wonders of Europe / Lilja / Olive trees surrounded with flowering yellow Bermuda buttercups (Oxalis pes caprae) Kaplika, Northern Cyprus, April 2009

Wild Wonders of Europe / Lilja / Olive trees surrounded by yellow Bermuda buttercups (Oxalis pes caprae) Kaplika, Northern Cyprus, April 2009

Wild Wonders of Europe / Giesbers / Wood cranesbill (Geranium sylvaticum) and Buttercups (Ranunculus breyninus) flowering with the Grauspitz (2,599m) in the distance, Liechtenstein, June 2009

Wild Wonders of Europe / Giesbers / Flowering Buttercups (Ranunculus breyninus) and Alpine forget-me-not (Myosotis asiatica) with the Grauspitz (2,599m) in the distance, the highest mountain in Liechtenstein, June 2009

Wild Wonders of Europe / Wothe / Flowering meadow with Thistles (Cirsium rivulare) and Buttercups (Ranunculus acris) Poloniny National Park, Western Carpathians, Eastern Slovakia, Europe, June 2009

Wild Wonders of Europe / Wothe / Flowering meadow with Thistles (Cirsium rivulare) and Buttercups (Ranunculus acris) Poloniny National Park, Western Carpathians, Eastern Slovakia, Europe, June 2009

Wild Wonders of Europe / Tønning / Buttercups (Ranunculus acris) flowering in a meadow, Oesling, Ardennes, Luxembourg, May 2009

Jane Burton / Two young European wild rabbits {Oryctolagus cuniculus} amongst Buttercups in a field

Jose B. Ruiz / Buttercups {Ranunculus sp.} growing in thawing Ice cave, Picos de Europa, Cantabria, Spain.

Jane Burton / Domestic Cat {Felis catus} 6-week, Abyssinian kitten walking in grass with Buttercups.

Colin Varndell / Red fox {Vulpes vulpes} cub in field of buttercups. UK.

Colin Varndell / Buttercups in grass meadow {Ranunculus sp} England

Chris O'Reilly / Buttercups in flower {Ranunculus acris} Derbyshire, UK.

Chris Gomersall / Flowering machair + beach Isle of Coll, Inner Hebrides, Scotland, UK

Chris O'Reilly / Buttercup flowers, UK

Nick Garbutt / Fragrant orchids (Gymnadenia conopsea) amongst Buttercups (Ranunculus sp.) and other wildflowers in ancient Alpine meadow. North Tyrol, Austria. June.

David Woodfall / Harebells (Campanula rotundifolia) with Buttercups (Ranunculus acris) and red clover (Trifolium pratense) growing on machair, North Uist, Outer Hebrides, Scotland, UK, July.

David Woodfall / Red clover (Trifolium pratense), Silverweed (Argentina anserina) and Buttercups (Ranunculus acris) growing on machair habitat, North Uist, Outer Hebrides, Scotland, UK,

David Woodfall / Red clover (Trifolium pratense) and Silverweed (Argentina anserina) growing with buttercups on machair habitat, North Uist, Scotland, UK. July.

Marie Read / Eared grebe (Podiceps nigricollis), adult in breeding plumage, swimming amidst Water crowfoot flowers, (Ranunculus aquatilis) flowers, Benton Lake National Wildlife Refuge, Montana, USA, July.

TJ Rich / Black and white springer spaniel amongst buttercups, Chilbolton Cow Common SSSI, Hampshire

TJ Rich / Black and white springer spaniel amongst buttercups, Chilbolton Cow Common SSSI, Hampshire, UK

Ernie Janes / Ragged robin (Lychnis flos-cuculi) and Buttercups (Ranunculus) England, UK, June.

David Woodfall / Dry stone walls in a field of Cow parsley (Anthriscus sylvestris) and Buttercups (Ranunculus acris), New House National Nature Reserve and North Pennine Dales Meadows Special Area of Conservation, Yor...

Michael Hutchinson / Tracking shot of a Marsh fritillary butterfly (Euphydryas aurinia) flying through grass and Buttercups (Ranunculus), Devon, England, UK, June.

Nick Upton / Common buttercups (Ranunculus acris) flowering in churchyard, Lacock, Wiltshire, UK, May.

Nick Upton / Roe deer (Capreolus capreolus) buck grazing in grassy woodland clearing at dusk, near Bath, England, UK. May.

Steve Downer / Panning shot across a field of Buttercups (Ranunculus), with a Mute swan (Cygnus olor) feeding, Meriden, Birmingham, England, UK, June.

Steve Downer / Mute swan (Cygnus olor) feeding in a field of Buttercups (Ranunculus), Meriden, Birmingham, England, UK, June.

Steve Downer / View of the River Blyth with a Mute swan (Cygnus olor) in the distance in a field of Buttercups (Ranunculus), Meriden, Birmingham, England, UK, June.

Nick Upton / Eurasian beaver (Castor fiber) grazing amongst Meadow buttercups (Ranunculus acer), Devon, England, UK, June

Nick Upton / Green winged orchids (Anacamptis morio) flowering alongside Meadow buttercups (Ranunculus acris), Clattinger Farm Wiltshire Wildlife Trust reserve, England, UK, May.

Nick Upton / Eurasian beaver (Castor fiber) feeding on grass amongst Meadow buttercups (Ranunculus acris) near a pond in a large enclosure, Devon, England, UK, June. Captive.

Nick Upton / Eurasian beaver (Castor fiber) feeding on grass amongst Meadow buttercups (Ranunculus acris) near a pond in a large enclosure, Devon, England, UK, June. Captive.

Nick Upton / Eurasian beaver (Castor fiber) feeding on grass amongst Meadow buttercups (Ranunculus acris) in a large enclosure, Devon, England, UK, June. Captive.

Nick Upton / Eurasian beaver (Castor fiber) feeding on grass amongst Meadow buttercups (Ranunculus acris) in a large enclosure, Devon, England, UK, June. Captive.

Nick Upton / Wood pigeon (Columba palumbus) feeding in long grass amongst Meadow buttercups (Ranunculus acris), Gloucestershire, England, UK, May.

Paul Harcourt Davies / Buttercups (Ranunculus) with Pheasant's eye (Narcissus poeticus) also known as Poet's narcissus this fragrant species occurs in drifts of thousands on the Piano Grande. Castellucio di Norcia, Umbria,...

Pal Hermansen / Madow buttercup (Ranunculus acris) Narsaq, Greenland, July.

Colin Varndell / Grey squirrel (Sciurus carolinensis) standing alert amongst buttercups. Dorset, UK.

SCOTLAND: The Big Picture / Pine marten (Martes martes) plagued by midges, amongst buttercups, Ardnamurchan, Lochaber, Highland, Scotland, UK, June.

SCOTLAND: The Big Picture / Pine marten (Martes martes) amongst buttercups, Ardnamurchan, Lochaber, Highland, Scotland, UK, June.

SCOTLAND: The Big Picture / Pine marten (Martes martes) portrait, amongst buttercups, Ardnamurchan, Lochaber, Highland, Scotland, UK, June.

SCOTLAND: The Big Picture / Pine marten (Martes martes) with moss in mouth, amongst buttercups, Ardnamurchan, Lochaber, Highland, Scotland, UK, June.

SCOTLAND: The Big Picture / Pine marten (Martes martes) amongst buttercups, Ardnamurchan, Lochaber, Highland, Scotland, UK, June.

Chris Mattison / Magpie Mine near Monyash surrounded by fields of Meadow buttercups (Ranunculus acris) Peak District National Park, Derbyshire, England, UK, May.

Terry Whittaker / Red fox (Vulpes vulpes) 8 week old cub standing in field of buttercups, Kent, UK May

Nick Turner / Grassland meadow with buttercups and orchids at Greystones Farm, Gloucestershire Wildlife Trust, Nature Reserve, Gloucestershire, UK. June 2015.

Jussi Murtosaari / Purple-edged copper (Lycaena hippothoe), male in grassland habitat, Parikkala, Finland, June.

Ernie Janes / Northern marsh orchids (Dactylorchis purpurella) in flower among buttercups, Machair, North Uist, Scotland, UK. June.

Ernie Janes / Northern marsh orchids (Dactylorchis purpurella) in flower among buttercups, Machair, North Uist, Scotland, UK. June.

Ernie Janes / Hay meadows and barns in field with buttercups and dry stone walls, Swaledale, near Muker Village Yorkshire, England, UK, June 2015.

Fabrice Cahez / Ox-eye daisy (Leucanthemum vulgare) and Buttercups (Ranunculus acris) and Plantain (Plantago) Vosges, France, May.

MYN / Corne van der Linden / Yellow buttercups (Hibbertia hypericoides) flowers, South-Western Australia. Australia.

Michael Hutchinson / Meadow buttercups (Ranunculus acris) in grass meadow, Ashton Court, Bristol, North Somerset, UK, May.

Michael Hutchinson / Meadow buttercups (Ranunculus acris) in grass meadow, Ashton Court, Bristol, North Somerset, UK, May.

Michael Hutchinson / Meadow buttercups (Ranunculus acris) in grass meadow, Ashton Court, Bristol, North Somerset, UK, May.

Michael Hutchinson / Meadow buttercups (Ranunculus acris) in grass meadow, Ashton Court, Bristol, North Somerset, UK, May.

Michael Hutchinson / Green-winged orchid (Anacamptis morio) in flower amongst Meadow buttercups (Ranunculus acris) in grass meadow, Ashton Court, Bristol, North Somerset, UK, May..

Michael Hutchinson / Wildflower meadow with green-winged orchids (Anacamptis morio), Cowslips (Primula veris) and Meadow buttercups (Ranunculus acris) in bloom , Ashton Court, North Somerset, UK, May.

Roland Seitre / Przewalski's horse (Equus ferus przewalskii) standing in buttercups. Parc de la Haute Touche, Obterre, France. May. Captive, occurs in Central Asia.

Roland Seitre / Przewalski's horse (Equus ferus przewalskii) grazing in buttercups, Parc de la Haute Touche, Obterre, France. May. Captive, occurs in Central Asia.

Roland Seitre / Przewalski's horse (Equus ferus przewalskii) standing among buttercups, Parc de la Haute Touche, Obterre, France. May. Captive, occurs in Central Asia.

Roland Seitre / Przewalski's horse (Equus ferus przewalskii) standing buttercups. Parc de la Haute Touche, Obterre, France. May. Captive, occurs in Central Asia.

Nick Upton / Ribwort plantain (Plantago lanceolata) flowering in a hay meadow alongside Meadow buttercups (Ranunculus acris) and Dandelions (Taraxacum officinale), Wiltshire, UK, May.

Nick Upton / Meadow buttercups (Ranunculus acris) flowering at the edge of a hay meadow on a river bank, Wiltshire, UK, May.

LYNN M. STONE / Guernsey cow lying in spring pasture, among Buttercups, Granby, Connecticut, USA

LYNN M. STONE / Holstein cow amid Buttercups and Dandelions in pasture, Granby, Connecticut, USA

Nick Upton / Eurasian beaver (Castor fiber) adult grazing grass among Buttercups (Ranunculus acris) on the margin of a marshland pond within a large enclosure after sunset, Devon, UK, June.

Nick Upton / Eurasian beaver (Castor fiber) adult grazing grass among Buttercups (Ranunculus acris) near the margin of a marshland pond in a large enclosure after sunset, Devon, UK, June.

David Woodfall / Ox eye daisies (Chrysanthemum leucanthemum) and Meadow buttercups (Ranunculus acris) sown to attract bees as part of the Friends of the Earth 'Bee Friendly' campaign with the Bron Afon Community Housi...

Matthew Maran / Meadow buttercups (Ranunculus acris) Hampstead Heath, London, UK, June.

Mark Hamblin / 2020VISION / Timelapse of cumulus cloud formations over machair habitat, with flowering Buttercups (Ranunculus), South Uist, Outer Hebrides, Scotland, UK, July 2011.

Klaus Echle / Red fox (Vulpes vulpes) running through buttercups, Black Forest, Baden-Wurttemberg, Germany. May.

RHONDA KLEVANSKY / Three Bermuda buttercups (Oxalis pes caprae) in flower, Namaqualand, South Africa, August.

Nick Upton / Ragged robin (Silene flos-cuculi) flowering alongside Common buttercups (Ranunculus acris) in a traditional hay meadow, Wiltshire, UK, June.

Nick Upton / Southern marsh orchids (Dactylorhiza praeternissa), Common spotted orchids (Dactylorhiza fuchsii), Yellow rattle (Rhinanthus minor) and Buttercups (Ranuncuus acris) flowering in a traditional hay mead...

Nick Upton / Common spotted orchid (Dactylorhiza fuchsii), pale form, flowering alongside Ragged robin (Silene flos-cuculi) Common buttercups (Ranunculus acris) and Red clover (Trifolium pratense) in a traditional...

Nick Upton / Dense stand of Ragged robin (Silene flos-cuculi) flowering alongside Common buttercups (Ranunculus acris) in a traditional hay meadow, Wiltshire, UK, June.

Nick Upton / Farm track leading to The Ridgeway with Cow parsley (Anthriscus sylvestris) and Buttercups (Ranunculus acris) flowering on the verges, Berwick Basset, Marlborough Downs, Wiltshire, UK, June.

Nick Upton / Farm track leading to The Ridgeway with Cow parsley (Anthriscus sylvestris) and Buttercups (Ranunculus acris) flowering on the verges, Berwick Basset, Marlborough Downs, Wiltshire, UK, June.

Nick Upton / Black Welsh mountain ewe (Ovis aries) walking with its black lamb through pastureland carpeted with Buttercups (Ranunculus acris), Marlborough Downs, Wiltshire, UK, June.

Nick Upton / Black Welsh mountain ewe (Ovis aries) calling as it walks with its black lamb through pastureland carpeted with Buttercups (Ranunculus acris), Marlborough Downs, Wiltshire, UK, June.

Ernie Janes / Red campion (Silene dioica) and Buttercups (Ranunculus acris) on field margin, Norfolk, UK, June.

David Pike / European otter (Lutra lutra) in buttercups, West Country Wildlife Photography Centre, captive, June.

Juan Carlos Munoz / Buttercups (Ranunculus) iflower in field, with Evergreen oak (Quercus ilex) in the background. Spain, May

Pal Hermansen / Buttercups (Ranunculus sp) flowering amongst abandoned cars, in 'car graveyard', Varmland, Sweden

Theo Bosboom / Wood cranesbill (Geranium sylvaticum) and Buttercups (Ranunculus) in flower, Asbyrgi, Iceland, June

Nick Upton / American miniature horse (Equus caballus) foal standing among Buttercups (Ranunculus acris) in a grassy hillside paddock, Wiltshire, UK, July.