 The distance by which robins migrate varies significantly depending on their initial habitat; a study found that individual robins tagged Alaska are known to travel as much as 3.5x further across seasons than robins tagged in Massachusetts.This species is actually a rare vagrant to western Europe, where the majority of records, more than 20, have been in Britain.In autumn 2003, migration was displaced eastwards leading to massive movements through the eastern U.S., and presumably this is what led to no fewer than three American robins being found in Britain, with two attempting to overwinter in 2003–2004, although one was taken by a sparrowhawk.