Some birds woo a mate by building the best nest. Males of many weaverbird species construct a series of intricately woven nests to impress a prospective partner. A male Red-winged Blackbird can even attract multiple mates if he controls prime breeding territory. Adélie Penguins construct their nests on mounds of stones, and partners often exchange stone gifts during the course of construction.

More info and transcript at BirdNote.org. 

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