Stephen Dalton / Froghopper (Cercopis vulnerata) adult in flight.

Wild Wonders of Europe / Giesbers / Black and red froghopper (Cercopis vulnerata) on plant stem, Liechtenstein, June 2009

Robert Thompson / Black and red froghopper (Cercopis vulnerata) East of Monte St Angelo, Gargano, Italy, April

MYN / Piotr Naskrecki / Two-lined Spittlebug (Prosapia bicincta) St Michaels, Maryland, USA, June. meetyourneighbours.net project

Andy Sands / Frog Hopper (Cercopis vulnerata) close-up on leaf. East Sussex, England, May.

Andy Sands / Frog Hopper (Cercopis vulnerata) close-up on leaf. East Sussex, England, May.

Andy Sands / Alder Spittlebug (Aphrophora alni) on Oak leaf, UK, captive, July

Andy Sands / Alder Spittlebug (Aphrophora alni) on Oak leaf, UK, captive, July

Simon Colmer / Common froghopper (Philaenus spumarius) nymph secreting protective liquid known as cuckoo-spit. England, UK

Stephen Dalton / Black and red froghopper (Cercopis vulnerata) in mid-hop. England, UK

Stephen Dalton / Black and red froghopper (Cercopis vulnerata) on leaf stem, UK

Stephen Dalton / Black and red froghopper (Cercopis vulnerata) UK

Gary K. Smith / Black and red froghopper {Cercopis vulnerata} at rest on phragmites reed, Norfolk broads, UK, June

PREMAPHOTOS / Common froghopper adult {Philaenus spumarius} newly emerged from nymphal skin and about to leave froth, 'cuckoo spit', covering UK

Nature Production / Froghopper / Spittlebug larvae {Aphrophora intermedia} nest of foam, Japan

Nature Production / Froghopper / Spittlebug larvae {Aphrophora intermedia} creating foam nest, Japan

Ross Hoddinott / Ribwort plantain {Plantago sp} + Cuckoo spit (froth secreted by Planthopper larvae, UK