American robin builds her nest, video

This video from the USA says about itself:

A female American Robin reinforces her nest with mud

27 January 2016

A female American Robin reinforces her nest with mud. Females build the nest from the inside out, pressing dead grass and twigs into a cup shape using the wrist of one wing. Other materials include paper, feathers, rootlets, or moss in addition to grass and twigs. Once the cup is formed, she reinforces the nest using soft mud gathered from worm castings to make a heavy, sturdy nest. She then lines the nest with fine dry grass. The finished nest is 6-8 inches across and 3-6 inches high.

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