Paul Harcourt Davies,Paul Harcourt Davies / Elder flower orchid (Dactylorhiza sambucina) in its two colour forms, Campo Imperatore, Gran Sasso, Appennines, Abruzzo, Italy, May

Ernie Janes / Yellow hammer (Emberiza citinella) on Elder tree, England, UK. May.

Bruno D'Amicis / Elder-flowered orchid (Dactylorhiza sambucina), yellow morph. Abruzzo, Central Apennines, Italy, May.

Rolf Nussbaumer / Ruby-throated hummingbird (Archilochus colubris), female in flight feeding on Yellow bells (Tecoma stans) flower, Hill Country, Texas, USA. August

Rolf Nussbaumer / Ruby-throated hummingbird (Archilochus colubris), male in flight feeding on Yellow bells (Tecoma stans) flower, Hill Country, Texas, USA. September

Rolf Nussbaumer / Ruby-throated hummingbird (Archilochus colubris), female in flight feeding on Yellow bells (Tecoma stans) flower, Hill Country, Texas, USA. September

Paul Harcourt Davies / Elderflower Orchid (Dactylorhiza sambucina) magneta and yellow forms, Piano Grande, near Norcia, Umbria Italy. May.

Paul Harcourt Davies / Elderflower Orchid (Dactylorhiza sambucina) magneta and yellow forms, Piano Grande, near Norcia, Umbria Italy. May.

Paul Harcourt Davies / Elder-flower orchid (Dactylorhiza sambucina) yellow form, on Monte Nero, Gargano, Puglia, Italy, April.

Paul Harcourt Davies / Elderflower orchid (Dactylorhiza sambucina) in its two colour forms on Campo Imperatore, Gran Sasso, Appennines, Abruzzo, Italy. May.

Paul Harcourt Davies / Elderflower orchid (Dactylorhiza sambucina) in its two colour forms on Campo Imperatore, Gran Sasso, Appennines, Abruzzo, Italy. May.

Paul Harcourt Davies / Elder flower orchid (Dactylorhiza sambucina) in flower with two colour forms, Campo Imperatore, Gran Sasso, Appennines, Abruzzo, Italy, May