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Description
Cliff swallows are colonial nesters, building their mud nests close to one another, in clusters. The gourd-shaped nests of cliff swallows are often located on buildings, cliffs and the undersides of bridges. Each lump of mud must be carried in the beaks of the birds from the puddle or bank of a stream or pond to the nesting site.

Description
Cliff swallows are colonial nesters, building their mud nests close to one another, in clusters. The gourd-shaped nests of cliff swallows are often located on buildings, cliffs and the undersides of bridges. Each lump of mud must be carried in the beaks of the birds from the puddle or bank of a stream or pond to the nesting site.