GRAY CATBIRD

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Gray Catbird
Copyright © 2005 Jerry Kumery

 Conservation Concern: NONE

Population Trend: Significant Decrease
Credibility: Good

The Gray Catbird is a common statewide breeder.  Nesting habitat includes woodlands with moderate to dense understory, forest edges, and marshland edges.  BCN eBird trend estimates show this species as likely decreasing during the past eight years.

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*:		  
  -5%   ----  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 794

Sample Size (Records): 496

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-11 to 1

  GOODNESS OF FIT:
Chi-square: 540.41, df 543, p 0.5233
Likelihood Ratio: 577.75, df 543, p 0.1462
AIC: -508.25
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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