Some of those birds, including gannets and storm petrels, spend much of their time over open water.
They appear to have been blown off course by the massive storm’s powerful wind currents.
The eastern shores of the United States are home to the Atlantic Flyway, which birds use when migrating between their summer homes in Canada to more tropical climes in winter.
But ornithologists say that the fall migration season had mainly ended when Sandy slammed into the New Jersey coastline on October 29.
An arrival just a few weeks earlier could have been devastating for migratory populations.
Earlier studies found that it can take up to five years for some species to rebound from destruction of their forest habitats brought on by a strong hurricane’s winds.