bed
A depression in grass, leaves, snow, or soil where an animal has lain down to rest, sleep, or chew cud. A deer bed is an oval of flattened vegetation, body-sized, often on a slope with a view of the approach below. The bed may hold warmth, scent, and shed hair — evidence of how long the animal stayed and how recently it left. Finding a warm bed means the animal heard you coming.
Etymology
Old English bedd, a sleeping place. The word is shared between human and animal use, and always has been — the animal's bed is as deliberate a choice of site as any human's.
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