Chris Mattison / Orange-tip butterfly caterpillar (Anthocharis cardamines) on Lady's smock / Cuckooflower (Cardamine pratensis) Gower Peninsula, Wales, UK, June.

Bernard Castelein / Orange tip (Anthocharis cardamines) male on Cuckoo flower (Cardamine pratensis) Klein Schietveld, Brasschaat, Belgium, May.

Bernard Castelein / Grizzled skipper butterfly (Pyrgus malvae) on Cuckoo flower (Cardamine pratensis) , Klein Schietveld, Brasschaat, Belgium

Chris Mattison / Orange-tip butterfly (Anthocharis cardamines) eggs on Cuckoo flower (Cardamine pratensis) Nottingham, England, UK, May. Focus stacked image.

Chris Mattison / Orange-tip butterfly (Anthocharis cardamines) eggs on Cuckoo flower (Cardamine pratensis) Nottingham, England, UK, May. Focus stacked image.

Alex Hyde / Cuckooflower / Lady's smock (Cardamine pratensis) flower, Peak District National Park, Derbyshire, UK. May.

Alex Hyde / Orange tip butterfly egg (Anthocharis cardamines) on Cuckoo flower / Lady's smock (Cardamine pratensis). Peak DIstrict National Park, Derbyshire, UK. May.

Alex Hyde / Orange tip butterfly egg (Anthocharis cardamines) on Cuckoo flower / Lady's smock (Cardamine pratensis). Peak DIstrict National Park, Derbyshire, UK. May.

Alex Hyde / Orange tip butterfly egg (Anthocharis cardamines) on Cuckoo flower / Lady's smock (Cardamine pratensis). Peak DIstrict National Park, Derbyshire, UK. May.

Andy Sands / Orange tip butterfly (Anthocharis cardamines) resting, covered in dew on Cuckooflower / Lady's smock (Cardamine pratensis) Hertfordshire, England, UK, April

Stephen Dalton / Lady's smock flower (Cardamine pratensis) Sussex, England, UK. April.

David Tipling / Orange-tip butterfly (Anthocharis cardamines) on Cuckoo flower (Cardamine pratensis) North Norfolk, UK, May.