Yva Momatiuk & John Eastcott / Minden / Calcium tufa formations, Mono Lake, California

Nigel Cattlin / Tomato (Solanum lycopersicon) with blossom end rot, symptom of calcium deficiency, cultivated in glasshouse. Berkshire, England, UK. July.

Claudio Contreras / Hierve el Agua rock formation with calcified minerals, resembling a waterfall. Oaxaca, southern Mexico.

David Perpinan / Radiography of the anterior section of a captive Leaf-tailed gecko (Uroplatus guentheri) showing cervical endolymphatic calcium stores. These stores are more prominent in females and are used as a cal...

Ingo Arndt / Calcium formations, Sarmiento Lake, Torres del Paine National Park, Patagonia, Chile

Ingo Arndt / Mountain Lion (Puma concolor) mother and young cub, Torres del Paine National Park, Patagonia, Chile

Ingo Arndt / Mountain Lion (Puma concolor) mother and cubs, Torres del Paine National Park, Patagonia, Chile

Ingo Arndt / Mountain Lion (Puma concolor) mother with cub, Torres del Paine National Park, Patagonia, Chile

Ingo Arndt / Mountain Lion (Puma concolor) young cub calling for mother, Torres del Paine National Park, Patagonia, Chile

Ingo Arndt / Mountain Lion (Puma concolor) mother and young cubs, Torres del Paine National Park, Patagonia, Chile. Siena International Photo Awards 2022 - Remarkable Artwork - Storyboard category - 'Wild Pumas of...

David Fleetham / Red encrusting sponge (Clathria sp) on calcium carbonate-producing Seaweed / Green algae (Halimeda kanaloana). Hawaii.

Ashley Cooper / Snails aestivating on a fence post in the Coto Donana, Andalucia, Spain, June 2011