Robert Thompson / Owlfly sulphur (Libelloides coccajus) on flower, near Gavarnie, Pyrenees National Park, France, June.

Edwin Giesbers / Owlfly (Libelloides coccajus) resting, Aosta Valley, Gran Paradiso National Park, Italy.

Lorraine Bennery / Owlfly (Libelloides coccajus) adult just emerged, Grands Causses Regional Natural Park, France, May.

Robert Thompson / Owly sulphur (Libelloides coccajus) on buttercup species (Ranunculus sp) Rugiano, Monte St Angelo, Gargano, Italy, April

Robert Thompson / Owly sulphur (Libelloides coccajus) on grape hyacinth (Muscari) flower, Rugiano, Monte St Angelo, Gargano, Italy, April

Paul Harcourt Davies / Owl fly (Libelloides coccajus) resting on meadow grass, nr Torre Alfina, Orvieto, Italy. May.

Robert Thompson / Owly sulphur owlfly (Libelloides coccajus) two resting on flower head, Pyrenees National Park, France, June.

Mike Read / Owlfly (Libelloides coccajus) resting on a grass stem, near the Col de Menee, Vercors Regional Natural Park, France, June

Mike Read / Owlfly (Libelloides coccajus) resting on a grass stem, near the Col de Menee, Vercors Regional Natural Park, France, June