Agustin Esmoris / Swallow-tailed Hummingbird (Eupetomena macroura) feeding on flower nectar, Argentina

Agustin Esmoris / Cactus (Echinopsis aurea) flowering, Bahia Blanca, Argentina

Agustin Esmoris / Bananaquit (Coereba flaveola) with Black-throated Mango (Anthracothorax nigricollis) feeding on flower nectar, Argentina

Agustin Esmoris / Bananaquit (Coereba flaveola) on flower, Argentina

Ingo Arndt / Purple Coneflower (Echinacea purpurea) flower, South Dakota

Alex Hyde / Frog Orchid (Coeloglossum viride) photographed against a white background in mobile field studio. Nordtirol, Austrian Alps. July.

Alex Hyde / Small Apollo butterfly (Parnassius phoebus) photographed in mobile field studio on a white background. Nordtirol, Austrian Alps. August.

Stephen Dalton / Marmalade hoverflies (Episyrphus balteatus) feeding on fallen lily pollen, England, UK. August.

Nick Upton / Golden weeping willow (Salix x sepulcralis) catkins, Wiltshire, UK, April.

Nick Upton / Common osier (Salix viminalis) female catkins, Wiltshire, UK, April.

Nick Upton / Golden weeping willow (Salix x sepulcralis) catkins, Wiltshire, UK, April.

Mark Taylor / Yellow Labrador Retriever bitch pup, 10 weeks, with a red rose and crossed paws.