Nature

Butterfly Gardening: Creating Habitat to Attract and Support Butterflies Butterfly gardening Butterfly gardening designs outdoor spaces to attract, feed and support butterflies and moths by providing nectar plants, host plants, water, shelter and pesticide-free habitat.

Calm: meaning, traits, history, and uses Calm Comprehensive overview of the adjective 'calm': definitions, characteristics, historical origin in Romance languages, everyday uses, related terms, and cultural notes.

Camouflage: nature’s visual disguise — forms, function, and uses Camouflage Camouflage is a visual strategy used by animals and humans to blend with surroundings or mislead observers. This article explains types, mechanisms, biological examples, history, a…

Candida: common yeasts, ecology, and human disease Candida Candida is a genus of yeasts that commonly live on humans and other animals. Some species are harmless commensals; others can cause superficial or invasive infections, especially i…

Canyon: formation, types, significance and notable examples Canyon A canyon (or gorge) is a deep, narrow valley with steep sides, typically carved by flowing water. This article explains how canyons form, their varieties, uses, and notable example…

Canyoneering (Canyoning): Exploring Canyons by Rappelling, Swimming, and Scrambling Canyoneering Canyoneering, also called canyoning, is a technical outdoor activity combining hiking, swimming, rappelling and route-finding through canyons and slot canyons, requiring specialize…

Cape Verde-type hurricane A Cape Verde-type hurricane is an Atlantic tropical cyclone that forms near the Cape Verde islands and often becomes a long-lived, powerful storm after crossing warm open ocean.

Carnelian: a reddish-brown variety of chalcedony used as a gemstone Carnelian Carnelian is a translucent to opaque reddish-brown chalcedony colored by iron oxides, used since prehistory in beads, seals and jewelry. It is closely related to sard and is often…

Cascade: meanings, forms, and significance across nature and systems Cascade Cascade describes a stepped waterfall and, by analogy, any sequence that flows or triggers from one element to the next in music, biology, engineering, computing, and social system…

Cave: Natural Underground Voids, Formation, Life and Human Interaction Cave An overview of caves: how they form, common types and features, biological communities, human use and exploration, and conservation considerations.

Caving (Spelunking): Exploring Underground Landscapes Caving Caving, or spelunking, is the recreational and scientific exploration of natural caves. This article covers equipment, techniques, hazards, history, scientific value, and distincti…

Cenote A cenote is a natural sinkhole where collapse of limestone exposes groundwater. Common on the Yucatán Peninsula and some nearby Caribbean islands, cenotes are hydrological, ecologi…

Cerulean: hue, history, and uses of the sky-blue spectrum Cerulean Cerulean denotes a family of blue shades evoking the sky or sea. This article explains its etymology, color variations, pigment history, artistic and cultural uses, and distinction…

Charnia (frond-like Ediacaran fossil) Charnia Charnia is a frond-shaped fossil genus from the Ediacaran Period, first recognised in Charnwood Forest (England). Its distinctive alternating branches inform debates about early mu…

Chest (Thorax): Structure, Function, and Variations Across Animals Chest Overview of the chest or thorax: its anatomy in vertebrates, equivalent segments in insects and crustaceans, functions in breathing and protection, and notable distinctions.

Christian naturism: belief, practice, and distinctions within Christianity Christian naturism An overview of Christian naturism, its theological basis, practices, history, distinctions from secular naturism, and social and legal considerations for believers who embrace nudi…

Cloud forest (montane cloud forest) Cloud forest A montane tropical or subtropical forest characterized by persistent low-level cloud cover at canopy height, abundant epiphytes and mosses, and strong roles in water capture and bi…

Coral (color) Coral is a warm pink-orange color named for marine corals. Used in art, fashion, and design, it has several variants and cultural associations of warmth, vitality, and feminine ele…

Cork (material): properties, harvesting, uses and sustainability Cork (material) Cork is the light, elastic bark material of the cork oak used for wine stoppers, insulation, flooring and many composites. It is renewable, hydrophobic and recyclable, with distinc…

Corpus cavernosum penis Paired erectile bodies of the penis composed of vascular spaces and smooth muscle; responsible for most blood storage during erection and clinically important in erectile function…

Coşna (commune in Suceava County, Romania) Coşna Coşna is a rural commune in Suceava County in the historical region of Bukovina, northeastern Romania, known for forested landscapes, traditional rural life and links to the Easter…

Cumulonimbus cloud A large, vertically developed cloud associated with thunderstorms and severe weather; forms from convective cumulus clouds and can produce heavy rain, hail, lightning, strong winds…

Cumulus cloud A cumulus cloud is a puffy, dense cloud formed by buoyant air. This article covers appearance, formation, common types, weather significance, and how cumulus differs from other clo…

Danaus (genus of milkweed butterflies) Danaus (genus) Danaus is a genus of medium-to-large milkweed butterflies in the subfamily Danainae (family Nymphalidae), including monarchs and tiger butterflies, known for warning coloration and…

Darkness: scientific, cultural, and practical perspectives Darkness Overview of darkness as the absence or reduction of visible light, its physical causes, measurement, biological effects, cultural meanings, and practical implications.

Dartmoor — moorland, tors, wildlife and human history Dartmoor Dartmoor is a rugged upland area in Devon, England, known for granite tors, open moorland, Dartmoor ponies, archaeological remains and protected habitats within a national park.

Deimatic defence: startle displays and bluffing in prey species Deimatic defence Deimatic defence is an anti-predator strategy in which prey use sudden displays to startle or intimidate predators, buying time to escape. It is distinct from, but can overlap with…

Derecho: overview, formation, hazards and safety Derecho A derecho is a long-lived, fast-moving line of severe thunderstorms that produces widespread, straight-line wind damage. This article explains formation, signs, impacts, and safety…

Doñana National Park: wetlands, dunes and conservation in southern Spain Doñana National Park Doñana National Park in Andalusia is a complex of marshes, dunes and woodlands that supports migratory birds and endangered species. This entry describes its location, habitats, hi…

Driftwood: formation, ecology, human uses and coastal impacts Driftwood Driftwood is wood transported by rivers, seas and lakes to shore. It influences coastal ecology, provides habitat and materials for people, and can pose hazards that require local…

Drone (insects, unmanned vehicles, and cultural uses) Drone Comprehensive overview of the term 'drone': its biological meaning for male insects, technological uses for unmanned vehicles, cultural and fictional appearances, history, and key…

Drop (liquid droplet) Drop A drop is a small volume of liquid held by cohesion and surface tension; it has characteristic shapes, formation processes, optical effects and practical roles in nature and techno…

El Cóndor — Andes mountain in Argentina El Cóndor El Cóndor is a high Andean peak in Argentina, reaching about 6,414 m. It is a notable six-thousander in the central Andes, of interest to mountaineers, geographers and regional con…

Eomaia: an early eutherian mammal from the Lower Cretaceous Eomaia Eomaia is a well-preserved Early Cretaceous eutherian mammal from the Yixian Formation of Liaoning, China, important for understanding early mammal anatomy, reproduction and the or…

European windstorm Extratropical cyclones that form over the North Atlantic and commonly strike western, northern and central Europe, producing strong winds, coastal surges and recurrent socioeconomi…

Eyespot (ocellus): form, function and examples of animal mimicry Eye-spot (mimicry) Eyespots (ocelli) are eye-like markings on animals. This article describes their forms, adaptive functions (mimicry, startle, deflection, courtship), evidence from experiments and…

Eyebrow: Structure, Function, Expression, and Cultural Practices Eyebrow Strip of hair above the eye that protects against moisture, aids facial expression, and is shaped by grooming and culture; covers anatomy, function, history, and cosmetic aspects.

Feral organisms: origins, ecology, and impacts Feral Feral organisms are formerly domesticated or cultivated plants and animals that live and reproduce in the wild; they affect ecosystems, economies, and conservation in complex ways.

Fibre: types, properties, and common uses Fibre A fibre is a long, thin, flexible strand of material. This article explains natural and synthetic fibres, their properties, historical development, main applications in textiles, i…

Firewood: Uses, Types, Seasoning, Storage, Safety, and Sustainability Firewood Firewood is wood gathered and prepared for burning. This article outlines common types, seasoning and storage, measurement, uses, safety and environmental considerations, and disti…

Fishery (fisheries) Fishery A fishery is any operation that raises, catches, processes or manages fish and other aquatic organisms. Fisheries include wild capture and aquaculture and have ecological, economic…

Fishing net A fishing net is a woven capture device used to catch aquatic animals. This article explains types, construction, history, uses, environmental concerns and basic maintenance.

Flooding of the Nile: causes, history, and modern consequences Flooding of the Nile The annual Nile inundation shaped Egypt's agriculture and culture. Overview of causes, timing, historical role, measurement, and how 20th-century dams altered floods, fertility and…

Foraging: Finding Food in the Wild — Ecology, History, and Practice Foraging Foraging is the act of searching for and obtaining wild food by animals and people. This article explains forms of foraging, its ecological role, human traditions, uses, and legal…

Foramen magnum: anatomy, function, and significance Foramen magnum The foramen magnum is the large opening in the occipital bone that connects the brain with the spinal cord. This article explains its anatomy, contents, evolutionary variation, and…

Fracture (breakage in materials, rocks, and bones) Fracture Fracture describes the separation or breakage of a solid body under stress. It covers physical failure in materials, rock fractures in geology, and bone fractures in medicine, plus…

Freckle: appearance, causes, differences, and care Freckle Freckles are small, sun‑responsive clusters of melanin most visible on fair skin. This article explains what freckles are, how they form, how they differ from similar spots, and ba…

Funnel cloud: rotating condensation that does not touch the ground Funnel cloud A funnel cloud is a rotating, funnel-shaped cloud of condensed water droplets that extends from a cloud base without contacting the ground or water. It can become a tornado or a wa…