|American Robin Male and Female|
It can be hard to tell male and female American Robins apart but there are subtle differences. Males are slightly larger than females, with a dark gray or black head, brown on their backs, reddish breast, and white under their tail feathers. Their throats are white, streaked with black and they have white crescents above and below their eyes.
Females are slightly paler in color than males, paler belly and browner back feathers. Young American robins have dark spots on their breasts and are also paler in color than adult males.
In the early stages of courtship, females may be pursued actively by one or several males. The female does most of nest building with some help from male. 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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