It is strongly bird migration, with many northern birds moving south during the winter.

Likely, it is related to weather conditions and how abundant the winter food sources are, which can determine whether other northern birds will move south.

It is mainly resident, but many northern birds migrate further south in the winter.

Many northern birds migrate to winter within the breeding range in central and western Mexico, though some remain further north.

Size varies from the larger northern birds to the southern ones.

Most of the population is resident, but some northern birds migrate south to Mexico in winter.

It has a wide distribution in Asia with northern birds migrating south for the winter.

It is mainly resident, but some northern birds migrate short distances.

This passerine is not migratory, but northern birds may make local movements.

It is not known to be migratory, however northern birds may move farther south during the winter.