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be a simple depression in the ground, or a hole in a rock , tree , or building . human-made materials, such as string , plastic , cloth , or paper , may also be used. nests can be found in all types of habitat . nest building is driven by a biological urge known as the nesting instinct in birds and
eggs and leave. brooding (incubating eggs by sitting on them) is common among birds. in general, nest complexity increases in relation to the level of parental care provided. [ ] nest building reinforces social behavior, allowing for larger populations in small spaces to the point of increasing the...
https://en.wikipedia.org/wiki/Nest