Answer:
The American Robin's diet generally consists of around 40 percent invertebrates, such as beetle grubs, caterpillars and grasshoppers, and 60 percent wild and cultivated fruits and berries.[12] It forages primarily on the ground for soft-bodied invertebrates, and finds worms by sight, pouncing on them and then pulling them up.[14] Nestlings are fed mainly on worms and other soft-bodied animal prey. In some areas, Robins, particularly of the coastal race T. m. caurinus will feed on beaches, taking insects and small mollusks. I got this from research.:)