Summary

Alfred Newton 1911 Encyclopædia Britannica, Volume 20… (1911)

The water-ousel's nest is a very curious structure—outwardly resembling a wren's, but built on a wholly different principle—an ordinary cup-shaped nest of grass lined with dead leaves, placed in some convenient niche, but encased with moss so as to form a large mass that covers it completely except a small hole for the bird's passage. The eggs laid within are from four to seven in number, and are of a pure white. The young are able to swim before they are fully fledged.
Source: Wikisource

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