Paul Harcourt Davies / Crab spider (Thomisus onustus) female, with fly prey on Cornflower (Centaurea cyanus), Sibillini, Umbria, Italy. May.

Paul Harcourt Davies / Female Pink crab spider (Thomisus onustus) sit on back of blue flower waiting to grasp unwary pollinator, Umbria, Italy. May.

Emanuele Biggi / Crab spider (Thomisus onustus) waiting in ambush on a cultivated rose in a garden, Mornese, Italy, June.

Emanuele Biggi / Crab spider (Thomisus onustus) waiting in ambush on a Composite flower (Asteraceae), Mornese, Italy, June.

Andres M. Dominguez / Crab spider (Thomisus onustus) on white flowerhead, Sierra de Grazalema Natural Park, southern Spain, May.

Paul Harcourt Davies / Crab spider (Thomisus onustus) waiting for ambush on Borage flower, Podere Montecucco, Umbria, Italy.

Paul Harcourt Davies / Crab spider (Thomisus onustus) waiting for ambush on Borage flower, Podere Montecucco, Umbria, Italy.