American Robin

Turdus migratorius



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Figure 1. Distribution of the American Robin.

Breeding occurs locally in Florida south to the dashed line.

Figure 2. Annual cycle of molt, breeding, and migration.

Thick lines show peak activity and thin lines show off-peak.

Figure 3. Relationship between size and climate in the American Robin.

The association between median wing length in male robins and mean noon values for climate variables in July for 21 ecoregions in the United States. Larger circles have larger robins; ecoregions in the East have solid circles and those in the West have open circles. Note that although dry-bulb temperature is negatively related to size variation in the east, wet-bulb temperature and absolute humidity are better predictors overall. From Aldrich and James (1991). Copyright Allen Press, used with permission.

Figure 4. American Robins consuming fruit.

The American Robin, shown here with English hawthorn (Crataegus monogyna), consume a large amounts of fruits during the autumn and winter months throughout its range; fruit selection has been well studied in this species. Drawing by Julie Zickefoose.

Figure 5. American Robin sonogram.

Sonogram recorded at Franklin County, Ohio on 15 May 1982. Prepared by Borror Laboratory of Bioacoustics (BLB), Ohio State University, using a Kay Elemetrics DSP 5500 Sona-Graph (with an effective frequency resolution of 150 Hz and a 200-point FFT transform size) from BLB recording no. 15825.

Figure 6. Nest and eggs of the American Robin.

Taken from the Illustrations of the Nests and Eggs of Ohio, 1879-1886. Drawings by G. E. Jones, N. E. Jones, and E. J. Schultz.

Figure 7. Regional trends in American Robin breeding populations.

Based on data from the North American Breeding Bird Survey, 1966-2013 (Sauer et al. 2014). Data show estimates of annual population change over the range of the survey; areas of increase are shown in blue and declines are shown in red. See Sauer et al. (2014) for details.

Figure 8. Relative abundance of American Robin during the breeding season.

Based on data from the North American Breeding Bird Survey, 1966-2013. See Sauer et al. (2014) for details.

Figure 9. Early winter density of the American Robin.

Based on data from the Christams Bird Count, 2003. Numbers show the number of individuals counted per 100 party hours in each region with CBC count circles.

Recommended Citation

Vanderhoff, N., P. Pyle, M. A. Patten, R. Sallabanks, and F. C. James (2016). American Robin (Turdus migratorius), version 2.0. In The Birds of North America (P. G. Rodewald, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA.