Nick Upton / European eel (Anguilla anguilla) elver wriggling up an Eel pass between clumps of nylon bristles on the side of a weir on a drainage channel as it migrates upstream at night, Somerset Levels, UK, Jul...

Nick Upton / European eel (Anguilla anguilla) elvers wriggling up an Eel pass between clumps of nylon bristles on the side of a weir on a drainage channel as they migrate upstream at night, Somerset Levels, UK, Ju...

Nick Upton / Clumps of Teide marguerites / Tenerife Daisies (Argyranthemum teneriffae) and Teide straw (Descourainia bourgaeana), endemic to Tenerife, flowering among old lava flows on the slopes of El Teide volca...

Nick Upton / Clumps of Teide marguerites / Tenerife Daisies (Argyranthemum teneriffae) and Teide straw (Descourainia bourgaeana), endemic to Tenerife, flowering among old lava flows on the slopes of El Teide volca...

Nick Upton / Three metre tall Mount Teide bugloss / Tower of jewels / Red Tajinaste (Echium wildpretii) flowering spikes alongside clumps of Canary catmint / Teide catmint (Nepeta teydea var. teydea) and Teide mar...

Nick Upton / Three metre tall Mount Teide bugloss (Echium wildpretii) flowering spikes alongside clumps of Canary catmint / Teide catmint (Nepeta teydea var. teydea) and Teide marguerites / Tenerife Daisies (Argyr...

Nick Upton / Three metre tall Mount Teide bugloss (Echium wildpretii) flowering spikes and clumps of Teide marguerite (Argyranthemum teneriffae) on misty mountainside, Teide National Park, Tenerife, Canary Islands...

Nick Upton / Three metre tall Mount Teide bugloss / Tower of jewels / Red Tajinaste (Echium wildpretii) flowering spikes and clumps of Teide marguerite (Argyranthemum teneriffae) on misty mountainside, Teide Natio...

Nick Upton / Clumps of Teide white broom (Spartocytisus supranubius) flowering on volcanic slopes with a sea of cloud rising and El Teide in the background in sunset light, Tenerife, May.

Nick Upton / Shrubby scabious (Pterocephalus lasiospermus) clumps flowering on mountain slopes, Teide National Park, Tenerife, May.

Nick Upton / Shrubby scabious (Pterocephalus lasiospermus) clumps flowering on mountain slopes, Teide National Park, Tenerife, May.

Nick Upton / European stonecrop (Sedum ochroleucum) clumps flowering on a limestone boulder by Gornje Bare glacier lake with peaks of the Zelengora mountain range, background, Sutjeska National Park, Bosnia and He...