[cobirds] Re: House Wrens increasing in Denver

I want to make a correction about what I said regarding the number of broods - I said up to three - they only brood 1-2 times, and add that All About Birds says clutch size can be 3-10 eggs (wow!)

Bob Santangelo
Wheat Ridge / Jefferson County

On Tuesday, July 14, 2015 at 4:42:08 PM UTC-6, Robert Righter wrote:

Hi all

The House Wren has always been an infrequent spring and fall migrant in our neighborhood in Denver. Last summer a few House Wrens were noted in our backyard. This summer the House Wren has blanketed not only our backyard but the whole neighborhood's backyards, to where the wren the now is the most common breeding bird species.

It is curious what environmental factors have triggered this increase. We rightfully take note of birds decreasing in populations but rarely take note of bird population increasing, except those that are considered pest species.

Could there could be common environmental reasons  for populations both increasing and decreasing? Perhaps knowing the reasons why some birds are increasing could help explain why some birds are decreasing? 

Bob Righter

Denver CO 

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