Neighboring groups of birds within the same species can create very different-looking nests — showing that their nest-building choices aren't solely controlled by instinct and the environment. Instead ...
Ornithologists have theorized that birds first began to build nests when they were unable to locate natural cavities. Of the 470 perching (passerine) birds in North America, about 25 percent use holes ...
A white-browed sparrow weaver inspects a roost under construction, after just receiving some grass brought by another member of its group. (Maria Cristina Tello-Ramos) Neighboring groups of birds ...
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