Ah, just found something on someone's web page about the nest building.
Quote:
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Female Robin continues to work on nest, alternating with sticks, grass and mud. The female uses her bill and feet to weave the nest from coarse grasses, sticks, stems, and string. She then uses her body to compress the mud, smoothing and shaping it with her breast. The male Robin helps very little if at all with the nest building.
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