Georgette Douwma / Coral reef scenery with a pair of Red Sea raccoon butterflyfish (Chaetodon fasciatus), Pygmy sweepers (Parapriacanthus guentheri) and soft corals (Dendronephthya sp) Egypt, Red Sea.

Laurent Geslin / Young girl from the Turmi village with traditional hair braiding with mud and butter, and shell jewellery, Omo valley, Ethiopia, 2006

Laurent Geslin / Woman from the Turmi village with traditional hair braiding with mud and butter, and shell jewellery, Omo valley, Ethiopia, 2006

Alex Mustard / Butter hamlet (Hypoplectrus unicolor) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Heather Angel / Common toadflax (Linaria vulgaris), orange nectar guides on lower lip and long spur containing nectar. Surrey, England, UK. Focus stacked.

Andy Sands / Butter Waxcap (Hygrocybe ceracea) A common waxcap fungi of grasslands, Bedfordshire, England, UK, February - Focus Stacked Image

Linda Pitkin / Red Sea raccoon butterflyfish (Chaetodon fasciatus), on coral reef, Beacon Rock reef, Strait of Gubal, Gulf of Suez, Egypt, Red Sea.

Linda Pitkin / Red Sea raccoon butterflyfish (Chaetodon fasciatus) Ras Katy, Gulf of Aqaba, Egypt, Red Sea.

Doug Wechsler / Peanut butter mill, Ecuador, February 2017.

Graham Eaton / Butter Tubs potholes at side of Thwaite to Hawes road, Yorkshire Dales, UK, November 2016.

Sylvain Cordier / Man treating invasive plant with herbicide around Laysan abatross (Phoebastria immutabilis), colony on Eastern island, a man treats the Golden Crown-beard (Verbesina encelioides), Midway Atoll Nationa...

Doug Wechsler / Leafy Brain / Brown witches butter (Tremella foliacea) on branch, Fort Washington State Park, Pennsylvania, USA