Mark Moffett / Honey Bee (Apis mellifera) workers maintaining hive, complex social behavior centers on maintaining the queen for a full life span of two to three years

Sebastian Kennerknecht / Excavator maintaining urban wetland, Diyasaru Park, Colombo, Sri Lanka

Paul D Stewart / Portrait of Georges-Louis Leclerc, Comte de Buffon. French naturalist (7 September 1707 - 16th April 1788). Steel engraving 1833 by Robert Hart with later colouring, from the painting by F.H. Drouais...

Mark Moffett / Researchers' military escort gets ice from bus while maintaining high speed, near the Afghan border, Iran

Ashley Cooper / Stone slabs used for repair work, piled up along the extremely popular Three Peaks footpath, Ingleborough, Yorkshire Dales National park, Yorkshire, UK. April, 2021.

Etienne Littlefair / Satin bowerbird (Ptilonorhynchus violaceus), maintaining his bower, Ravenshow, North Queensland, Australia, October.

Milan Radisics / Bulldozer maintaining wall of an ash pond, East-Central Europe. After coal is burned in power plants, the waste ash is mixed with water and pumped through pipelines into sludgy lagoons commonly known...

Milan Radisics / Bulldozer maintaining shore of the high dam covered with trees. Red mud deposits, alkaline waste product from aluminium industry. Galicia, Northern Spain.

Tui De Roy / Alcedo giant tortoise (Chelonoidis vandenburghi), Alcedo Volcano, Isabela Island. This is where the largest extant population exists, acting as ecosystem engineers by maintaining open meadows and digg...

Tui De Roy / Alcedo giant tortoises (Chelonoidis vandenburghi) wallowing, Alcedo Volcano, Isabela Island. This is where the largest population still exists, acting as ecosystem engineers by maintaining open meadow...

Shane Gross / Banded jawfish (Opistognathus macrognathus) maintaining his burrow off Man Island, Eleuthera, Bahamas.