Graph

Northern Shrike
(Lanius borealis)

Picture of logo Christmas Bird Count (CBC)

Additional information on: Christmas Bird Count (CBC)

Geographic area or population: North America

Graph showing the trend of the species through out the observed years
 
Listing of the threshold values that appear on the graph
Population below lowest acceptable levelGoal
1.217 1.622
Listing of the individual data points that make up the graph
YearAnnual indexLower limitUpper limit
19701.791.592.04
19711.621.431.85
19721.591.411.8
19731.581.411.79
19741.551.381.76
19751.581.411.78
19761.781.62.01
19771.861.672.11
19781.751.581.97
19791.491.331.7
19801.421.271.59
19811.551.411.72
19821.351.221.51
19831.421.291.59
19841.61.451.79
19851.571.431.74
19861.571.431.74
19871.61.461.78
19881.591.451.77
19891.521.381.7
19901.511.381.67
19911.581.441.75
19921.431.291.6
19931.421.291.59
19941.521.391.7
19951.831.692.01
19961.431.31.6
19971.341.211.5
19981.431.311.59
19991.561.431.72
20001.421.31.57
20011.21.091.35
20021.181.061.33
20031.41.281.56
20041.381.251.54
20051.351.231.51
20061.341.211.51
20071.561.431.74
20081.391.261.57
20091.271.151.43
20101.51.361.69
20111.421.281.6
20121.551.411.75
20131.351.211.55
20141.31.171.48
20151.271.141.46
20161.271.131.46

Notes on numeric data: Ex represents 10 to the power of x; For example 1.2345E-2 is equivalent to 0.012345