American Robin - Turdus migratorius
General Description
The largest thrush in North America. Overall length 25 cm, average body mass 77 g. Male has deep grayish to dark-brown upperparts with blackish head, white crescents above and below eye, rich reddish underparts with white throat streaked with black and white undertail-coverts. Bill is yellow. Female is similar but paler overall. (Sallabanks, Rex and James, Frances C., The Birds of North America, No. 462, 1999).
Distribution
Montana Range
Observations in Montana: 21545
Montana Counties, Beaverhead, Big Horn, Blaine, Broadwater, Carbon, Carter, Cascade, Chouteau, Custer, Daniels, Dawson, Deer Lodge, Fallon, Fergus, Flathead, Gallatin, Garfield, Glacier, Golden Valley, Granite, Hill, Jefferson, Judith Basin, Lake, Lewis and Clark, Liberty, Lincoln, Madison, McCone, Meagher, Mineral, Missoula, Musselshell, Park, Petroleum, Phillips, Pondera, Powder River, Powell, Prairie, Ravalli, Richland, Roosevelt, Rosebud, Sanders, Sheridan, Silver Bow, Stillwater, Sweet Grass, Teton, Toole, Treasure, Valley, Wheatland, Wibaux, Yellowstone
Migration
In the Bozeman area, normal migration periods are March 2 to May 5 and September 1 to November 1.
Habitat
Most widespread North American thrush. Frequents forest, woodland, and gardens, breeding primarily where lawns and other short-grass areas are interspersed with shrubs and trees, such as residential areas, towns, farmyards, and parks. (Sallabanks and James 1999).
Food Habits
Invertebrates and fruit. (Sallabanks and James 1999).
Ecology
Territory sizes average 3.65 acres in Douglas fir forests in western Montana.
Reproductive Characteristics
Near Fortine, the first brood egg dates are April 29 to July 12. The earliest 2nd brood is June 1, the 1st brood fledging is May 22 to August 2, and the 2nd brood fledging is June 22 to July 31. Statewide, eggs first appear in mid-May, with nesting into mid-August.