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Percentage composition of 10 most common fruit and invertebrate taxa found in American Robin stomachs in the eastern (Atlantic Coast states and provinces westward to Ontario, Minnesota, Iowa, Missouri, Arkansas, and Louisiana) region, compared to the central (states and provinces between the eastern and western regions) and western (Pacific Coast states and provinces eastward to Idaho, Nevada, and Arizona) regions. Percentages are based on number of occurrences of each food type (fruits or invertebrates). Data from stomach sample records compiled by the U.S. Biological Survey and U.S. Fish and Wildlife Service; modified from Wheelwright 1986. Copyright Allen Press, used with permission.

Food itemEastCentralWest
Fruit genera
Prunus2358
Cornus710
Rhus710
Rubus611
Smilax640.5
Vaccinium410.5
Ilex430
Morus440
Celtis3130
Juniperus320
Total number of fruit genera502723
Invertebrate taxa
Lepidoptera (unidentified)12127
Carabidae101311
Curculionidae8109
Scarabaeidae875
Formicidae754
Elateridae555
Acrididae542
Coleoptera (unidentified)4511
Arachnida442
Pentatomidae311
Total number of invertebrate families916648