RED-TAILED HAWK

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Red-tailed Hawk
Copyright © 2005 Eric Secker

 Conservation Concern: NONE

Population Trend: Increasing
 Credibility: Mod. Good

The Red-tailed Hawk is a common statewide breeder.  Preferred habitat includes forest edges, open woodlands, and hedgerows with mature trees.  The Red-tailed Hawk has increased considerably in Illinois during the past twenty years in areas monitored by the BCN Census. 

Trend Level

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1997-2004 Trend
 Point Count Data		 1988-2004 Trend*
 All Observation Types

*Data gathered using a assortment of sampling methods  - for casual inferences only
  Avg. Yearly
Rate of Change:

The vertical axis numbers represent an index of the population change.

Note that the scales may vary between graphs.

 Avg. Yearly
Rate of Change*:		  
  10%   8%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 87

Sample Size (Records): 68

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-10 to 31

  GOODNESS OF FIT:
Chi-square: 174.15, df 147, p 0.0626
Likelihood Ratio: 149.22, df 147, p 0.4334
AIC: -144.78
NOTE: (model fits if p values are above 0.05)

Download Table of All Observations

 
 

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Copyright © 2005 Audubon - Chicago Region & Bird Conservation Network

 
 
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