Ten year Purola Bird Records

Monthly bird records for the past 10 1/2 years have been tabulated using colored dots to show the relative frequency of occurrence for each month during the period January 1986 through July 1996. The records for some 180 birds are divided into four somewhat arbitrary page-groupings (for downloading convenience):
(1) year-around birds; (2) winter birds; (3) summer birds; and (4) rare and incidental birds

The colored dots of the table reflect the following scale:
most frequent every year of the period (or all but one)
|
|
|		 in roughly two thirds of the years
in roughly half of the years
in roughly one third of the years
least frequent in only one year

For example, the hummingbirds (all grouped with the summer birds, even though Rufous Hummingbird has been recorded in all months but May and June), appear as:
  J F M A M J J A S O N D
Ruby-throated hummingbird            
Black-chinned hummingbird          
Rufous hummingbird    

We see that Black-chinned Hummingbirds, which breed at Purola, have been recorded in virtually every year between March and August. The non-breeding migrant Ruby-throated have been equally common only in August and September. Rufous are less common, and have been observed in more than one year only in July and August; the single-year winter and spring Rufous records represent a single bird that stayed over the 1995-96 winter.

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