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A cliff or vertical rock exposure in mountainous areas, especially in the north of England and Scotland.
A rock-climbers' term for a cliff or group of cliffs, in any location, which is or may be suitable for climbing.
Crag and tail, a geological formation caused by the passage of a glacier over an area of hard rock.
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Crags are formed when a glacier or ice-sheet passes over an area that contains a particularly resilient chunk of rock (often a granite plug or other volcanic structure).
Frequently the crag serves as a partial shelter to softer material in the wake of the glacier, which remains as a gradual fan or ridge forming a tapered ramp (called the tail) up the leeward side of the crag.
The Crag Martin, Ptyonoprogne rupestris, is a small passerine bird in the swallow family.
Crag Martins are somewhat similar in habits and appearance to the other aerial insectivores, such as the related swallows and the unrelated swifts (order Apodiformes).
Crag Martins build neat quarter-sphere nests lined with mud collected in their beaks, and lay 3-5 eggs.
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