RUBY-THROATED HUMMINGBIRD

Ruby-throated Hummingbird
Copyright © 2005 Eric Secker

Conservation Concern: NONE

Population Trend: Decreasing?
Credibility: Poor

The Ruby-throated Hummingbird is an uncommon to rare breeder in the CW Region, fairly common in regions to the south. Preferred habitat includes open woodlands, forest edges, and shrublands with trees. BCN census data shows largely conflicting short-term and long-term trends. BBS trends for Illinois show a 4.7% annual increase. Sample size is low for this uncommon, often silent, and easy to miss species.

Trend Level

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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*:

-12%

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 19

Sample Size (Records): 17

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-51 to 28

GOODNESS OF FIT:
Chi-square: 40.86, df 34, p 0.1946
Likelihood Ratio: 37.52, df 34, p 0.3109
AIC: -30.48
NOTE: (model fits if p values are above 0.05)

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