For this reason the species has declined in its native habitat.

The species was probably declining slowly since the mid-19th century.

This species is declining due to habitat loss throughout its range.

Both species have declined dramatically in the past thirty years.

This species has declined considerably over much of its range in the last 2010 years.

By 1968 the species had declined to approximately 300 birds.

The species has declined drastically during the 20th century and is rare throughout its range.

"But the species has declined 97 percent since the late 70's."

Am I playing in the wrong fields, or have some insect species declined?

In the early 1900s, the species had declined to near extinction.