Nick Upton / Horned treehopper / Thorn-hopper (Centrotus cornutus) on nettle stem at the edge of a meadow, Wiltshire, UK, May.

Nick Upton / Horned treehopper / Thorn-hopper (Centrotus cornutus) on nettle stem at the edge of a meadow, Wiltshire, UK, May.

Paul Bertner / Treehopper (Membracidae)mimicking a thorn, Udzungwa Mountains National Park, Tanzania

Alex Hyde / Thornbug (Umbonia crassicornis) San Jose, Costa Rica.

MYN / Piotr Naskrecki / Treehopper (Umbonia crassicornis) Costa Rica. meetyourneighbours.net project

John Cancalosi / Three Thorn bugs (Umbonia sp) on twig, Costa Rica

John Cancalosi / Thorn bug (Umbonia sp) guarding young, Costa Rica

John Cancalosi / Two Thornbugs (Umbonia sp) on underside of twig, Costa Rica

John Cancalosi / Two Thorn bugs (Umbonia sp) on twig, Costa Rica,

Piotr Naskrecki / Treehopper (Umbonia crassicornis) mimicking thorn, La Selva Biological Research Station, Heredia, Costa Rica

Piotr Naskrecki / Flatid Planthopper (Flatidae) thorn mimic, Barbilla National Park, Costa Rica

Piotr Naskrecki / Leafhopper, Atewa Range, Ghana