Date: 4/9/18 3:21 pm
From: Richard Trinkner <richardinboulder...>
Subject: Re: [cobirds] House Sparrows - Boulder & metro area
Some personal House Sparrow data:

Between 1996 and 2015, House Sparrows appear on 30.16% of my Colorado
checklists.

Between 2015 and 2018, they appear on only 13.44% of my Colorado checklists.

They used to be very common bird for my backyard feeders. Between 1996 and
2015, House Sparrows were on 58.21% of my backyard checklists. *So far in
2018, I haven't had a single House Sparrow*. Not one. I've completed 26
checklists for my yard this year: not a single House Sparrow.

In Boulder, House Sparrows seem to be hanging on in small numbers in very
urban areas. I walk to work most mornings in central Boulder. I used to
nearly trip on House Sparrows. I still see them often (72% of my morning
walk checklists), but now I have to listen carefully for their call and I
generally only get a small handful of individuals.

On the center-north Boulder CBC route on which I counted last December, we
only found sparrows in only two locations, whereas in past years they were
extremely common.

Here's an article about their decline:
https://www.sciencedaily.com/releases/2017/10/171003111056.htm.

I've also read that they may be particularly susceptible to cell phone
tower radiation, and that their bug food source may be susceptible to such
radiation as well.

Cheers,

Richard Trinkner
Boulder



On Mon, Apr 9, 2018 at 11:48 AM, 'Hugh Kingery' via Colorado Birds <
<cobirds...> wrote:

> Denver Audubon just received a call from a woman in Lafayette with a
> unique subject: where have the House Sparrows gone?
>
> She says she used to have as many as 80, but now she sees only a pair or
> two, sproadically. They check out her yard and continue on somewhere else.
> Have any of you experienced a diminishing numbers of House Sparrows?
>
>
> Hugh Kingery
>
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