The species has been expanding its range southward in recent years.

In the decade since listing, Least Bell's Vireo numbers have increased 6-fold, and the species is expanding into its historic range.

The species has recently expanded its range into New Zealand.

Since it was first reported in 1952 in Texas, this species has been expanding its range.

Avian species have expanded their range since long before humans.

At the same time, species like deer, which are clearing rather than true forest animals, have expanded their range and proliferated in these altered landscapes.

This species has recently expanded its native range.

As the species expands its range as a whole the individuals can take advantage of the unclaimed territory, which previously had an unsuitable climate.

This species is locally abundant and is expanding northward in Siberia, so there are no concerns about its conservation status.

On average, since the Grinnell period, these species have expanded their ranges upwards by 2,100 feet in the Yosemite area.