Yup... It's nothing to see 10-15 in a bunch...most Robins move south in winter. we have winter Robins in Ohio that migrate here from up north. these are mostly not the same ones that will be back in the spring. some might not leave, but those that stay move around a lot for food and are usually in flocks.
Yeah I knowI am amazed at the number of birds I have seen this year that have not migrated. Drive over the Olentangy and Scioto rivers and you'll see the Geese and Ducks have not migrated.