Global Short Term Trend: Increase of 10-25% to decline of 30%
Comments: Difficult to assess globally. Stable to increasing in many places where it is not native and in some Neotropical places where it is. North American populations, which are still a large portion of the global total, are well documented to be declining, but fluctuate from year to year. California based populations may be down more than 90% from 1997-2009.
Global Long Term Trend: Increase of >25% to decline of 50%
Comments: See short term.