Eric Baccega / Mountain gorilla (Gorilla beringei beringei) drinking from a mountain stream. Bwindi Impenetrable Forest National Park, Uganda, Africa

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

Nick Upton / Paper wasp (Polistes dominula) drinking moisture from cuckoo spit around developing froghopper (Cercopidae) nymph, Port Cros Island National Park, Hyeres archipelago, France, May.

Nick Upton / Paper wasp (Polistes dominula) approaching cuckoo spit around developing froghopper (Cercopidae) nymph, Port Cros Island National Park, Hyeres archipelago, France, May.

Stephen Dalton / Cuckoo spit created on grass to protect eggs and nymphs by Froghoppers (Cercopidae) UK

Stephen Dalton / Froghopper {Cercophidae} on plant stem, UK

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

Michael & Patricia Fogden / Froghopper (Cercopidae) group feeding on Heliconia (Heliconia latispatha), Costa Rica

Philippe Clement / Froghopper {Philaenus spumarius} next to white froth 'cuckoo spit' La Brenne, France.

Mark Moffett / Froghopper (Cercopidae) pair, near Kuching, Borneo

Konrad Wothe / Froghopper (Cercopis sanguinolenta) close-up on a leaf, Germany

Mark Moffett / Froghopper (Cercopidae) with wing markings mimicking a jumping spider

Mark Moffett / Meadow Froghopper (Philaenus spumarius) young queen entering hole she's chiseled inside Cecropia tree, carrying food grown by the tree, Peru