Nest
* Collect and observe empty nests.
* Have at least one nest for every three to four hens.
* Many nests also perish by being covered by waves
  - are destroyed by many different predators
  - contain more or less snakeskin, and some are largely lined with it
  - fail because of disturbance and destruction
* Most nests are below ground around rotten stumps or on the sides of terraces, gullies and ditches
  - in the ground under stumps or shrubs
  - near streams that provide adequate food when young are in the nest
  - started by a single pair of birds
  - sunken so as to be flush with the ground surface
  - have only one queen who lays all the eggs
  - produce two young, which are full-grown when they leave
  - receive an inner lining of soft material such as moss
* Some nests are aerial, but most often, the nests are subterranean or both aerial and subterranean
  - built in tall grass
  - dug away from the burrow, usually under a shrub
  - in trees and some in boxes
  - lost to predators but an important factor causing nestling mortality is starvation
  - shaped much like birds' nests and are higher than the surrounding soil
* Some nests are so filled with clutter, there is no room for the eggs, even for the little birds
  - full of yellowjacket remains that the inside has a yellowish cast to it
  - the size of a car
  - attract hummingbirds
  - even have a built-in ventilation system to circulate fresh air
* Some nests have a fake entrance that dead-ends to trick predatory snakes
  - sparse linings of grass
  - produce only queens, others only males, and some nests produce both males and queens
  - remain active or have already produced fledglings-chicks capable of leaving the nest
* also allow easy transfer of young litters between cages at cleaning time
  - are guarded by males in some gobies, blennies, and sculpins
  - become vulnerable to freezing when water diversions and drought lower water levels
* appear to be designed to maintain high humidity.
* are a bulky collection of sticks and rushes found in fresh or brackish swamps and lakes
  - platform of sticks, often in shrubs or trees, sometimes on the ground
  - are mounds made with raked up dirt, debris grass and leaves
* are built every year
  - of sticks, twigs, vegetation and whatever else the cormorants can find lying around
  - on cliffs, in trees, on embankments, on man-made structures, and on the ground
  - considered mounds if they protrude from the earth's surface
* are constructed continuously through incubation
  - from branches and twigs gathered from the ground, trees, and old nests
  - high in the canopy of emergent rainforest trees
  - of emergent vegetation and feathers, on the ground surrounded with water
  - using sticks and leaves, and are built in trees and cliffs
  - with twigs and bark strips lined with feathers, hair and cocoons
  - defended by the parents
  - dug as burrows or placed under some surface object
  - formed either in trees, in soil mounds or underground
  - furniture
  - gang
  - highly susceptible to predators as well as to trampling by cattle or people
  - holes in trees with soft rotting wood
  - important in protecting the eggs and young from predators and extreme temperatures
* are large and usually found low in trees and constructed of layers of twigs and dead leaves
  - heaps of vegetation in water, surrounded by a screen of emergent vegetation
  - large, paper like, pendulous structures suspended from tree branches
  - lined with soft materials such as wool, moss, cotton, leaves, bark, fur, or grass
* are made for roosting in at night and for shelter in bad weather
  - from stones, sticks and twigs and are built on the ground
* are made in burrows, caves and rocky crevices, under tree roots, and in nest boxes
  - crevices of stone walls, both manmade and natural
  - on the ground with sticks, leaves etc
  - with fibers and lichens held together with spider webs
  - natural objects
  - parasitized by cowbirds
  - raided by humans in places such as Southeast Asia
  - retreats
  - subject to flooding if water levels in salt ponds are raised
  - surrounded by water, on islands, beaver or muskrat lodges, or on floating vegetation
* are used as nurseries, resting areas, and as protection against weather
  - year after year, and often built up from one year to the next
  - usually very simple structures built in the fork of a tree
* are where eggs grow
  - stay
* can also cause chimney fires when the nesting material and debris catches fire
  - be cavities excavated in trees and snags or remodeled birds nests
  - interfere with power-lines and other structures
* commonly contain a hundred bees or so.
* consist of a homeycomb of hexagonal cells located in a hollow tree or in frames of beekeepers
  - dried leaves, twigs, and fibers of soft wood
* contain leaves, twigs, shredded bark, mosses, insulation, and other soft material
  - many tiers of cells covered by the outer shell with a single opening at the bottom
* have multiple layers.
* includes sections.
* keep penguins warm.
* located in banks, walls, tree trunks or buildings require the use of insecticides.
* occur in cavities in weeds or shrubs, or in the ground.
* often exhibit divided living, with eggs and food stores kept in distinct parts of the hive.
* resemble eagle nests and are made of twigs.
* serve as a site to lay eggs, and as a retreat
  - breeding, feeding and sleeping platforms and act as territorial flags
* usually occur in colonies at predator resistant sites, such as on islands.
* woven from gathered twigs suddenly appear in boughs of trees.
+ Red billed Quelea: Passeriformes
  * Nests are built by the males and take about seven days to complete. Males defend the nest while building it and become very angry when something gets too close. After it is complete, females lay 3 to 7 eggs. Eggs hatch in about two weeks. Males continue to defend the nest after the eggs hatch.