State of the Birds:Documenting Changes in Massachusetts Birdlife

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Habitat:   Breeds or Winters in Coastal or Forest or Forested Wetland or Grassland or Open Freshwater Marsh or Pelagic or Rivers, Lakes, and Ponds or Saltmarsh or Shrubland or Urban and Suburban Behaviors:   Aerial Insectivores

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Common Name     taxa sort alpha sort	BBA1 Blocks*	BBA2 Blocks*	BBS Trend, % Chg*	BBS Trend, P Value*	CBC Trend, % Chg*	CBC Trend Sign.*
Acadian Flycatcher	3	33
Alder Flycatcher	97	288	3.8	0.09
Bank Swallow	274	205	-4.4	0.14
Barn Swallow	742	759	-0.6	0.28
Chimney Swift	630	650	-2.3	0.02
Chuck-will's-widow	0	3
Cliff Swallow	128	59	-11.1	0.35
Common Nighthawk	47	12
Eastern Kingbird	746	792	-3.7	0.00
Eastern Phoebe	670	787	-1.7	0.02	4.7	yes
Eastern Whip-poor-will	180	97	-4.6	0.57
Eastern Wood-Pewee	594	744	-0.7	0.2
Great Crested Flycatcher	519	743	-1.5	0.00
Least Flycatcher	349	351	-4.4	0.00
Northern Rough-winged Swallow	185	364	7.4	0.45
Olive-sided Flycatcher	17	7
Purple Martin	24	12	0.9	0.77
Tree Swallow	703	791	-1.8	0.06	9.9	no
Willow Flycatcher	114	363	4.3	0.01
Yellow-bellied Flycatcher	2	4

* Definitions of columns:

BBA1 Blocks:

Number of census blocks in which this species was Confirmed, Probably Found or Possibly Found breeding during the Breeding Bird Atlas 1 survey, 1974 - 1979.

BBA2 Blocks:

Number of census blocks in which this species was Confirmed, Probably Found or Possibly Found breeding during the Breeding Bird Atlas 2 survey thus far, 2007 - 2011.

BBS Trend, P Value:

The statistical P value of the BBS trend data.

CBC Trend, % Chg:

The average percentage change in the Christmas Bird Count results, taken 1963 - 2008.

CBC Trend Sign:

The statistical significance of the CBC trend data.