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BLACK-CROWNED NIGHT-HERON

The Black-crowned Night-Heron is an uncommon to rare breeder in the CW Region. This species has declined dramatically during the past century. Some proposed reasons for their declines in our area include disturbance, filling in of marshes, and competition with cormorants and other waders. The BCN Survey does not adequately monitor wetlands. Retaining large tracts of willows and maintaining hemi-marsh habitat may help this species where it still breeds. . Photo: © Heather Secker

BLACK-CROWNED NIGHT-HERON  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    Annual Change Pct. Error      
  Endangered   17   67   Poor   +27% +/-47%      

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IL-ENDGR

 

 

 

 

 

 

 

 

 

Uncertain

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1999-2007 TREND - Point Counts

 

 

 

 

 

 

 

 

BLACK-CROWNED NIGHT-HERON

 

 

 

 

    Goodness of Fit
Chi-Square: p= 0.1211
     

 

 

 

 

 

 

 

 

Passes

 

 

 

    model fits if p >0.05 (model
estimate is not significantly
dif. from observed counts)
     
           

 

     
Copyright © 2008 Audubon - Chicago Region & Bird Conservation Network