Graph

Black-crowned Night-Heron
(Nycticorax nycticorax)

Great Lakes Decadal Colonial Waterbird Census

Additional information on: Great Lakes Decadal Colonial Waterbird Census

Geographic area or population: Great Lakes

Graph showing the trend of the species through out the observed years
 
Listing of the individual data points that make up the graph
YearEstimated number of nests
19761748
19891835
19972313
20072183

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