Excerpt from The Oologist, Vol. 3: Issued in Behalf of the Science Which It Advocates; March, 1877
There are at least two distinct portions to the nests of birds which nidulate in trees and bushes, the foundation and the nest proper. The basis however, is not neces sarily its bottom some of our Flycatchers, Thrushes and Warblers first establish a firm support or skeleton nest of straws, pellets of mud, leaves, or twigs, over and united with which are the finer materials which compose the nest proper. That of the Blue-gray Gnatcatcher is an example of this form of architecture, * wherein the lichens which apparently form the greater part of its bulk, are in reality only an outer cover ing. Most of the Thrushes, the Pewee, Cliff and Barn Swallows and other species intermix the leaves, stems, straws etc. With pellets of mud, thus insuring a solidity not found in nests of double formation. In the place of mud, many birds aid in strengthen ing the adherence of the materials with sa liva.
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