For what it is worth, I just did a regression analysis of House Sparrow numbers reported on the Colorado Springs CBC since 1950 to present. There is no evidence of a decline in numbers on the CBC.
Diana Beatty Colorado Springs, CO On Mon, Apr 9, 2018 at 12:05 PM, Richard Trinkner < [email protected]> wrote: > 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 < > [email protected]> 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 >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Colorado Birds" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> To view this discussion on the web visit https://groups.google.com/d/ms >> gid/cobirds/162ab861dc0-179e-141ed%40webjas-vab073.srv.aolmail.net >> <https://groups.google.com/d/msgid/cobirds/162ab861dc0-179e-141ed%40webjas-vab073.srv.aolmail.net?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google Groups > "Colorado Birds" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/cobirds/CAG_%3D4ze9kikJLnDM7G690pdv03y%2BKcPhbyCtZiFTa_WOdfnqug% > 40mail.gmail.com > <https://groups.google.com/d/msgid/cobirds/CAG_%3D4ze9kikJLnDM7G690pdv03y%2BKcPhbyCtZiFTa_WOdfnqug%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- ****** All that is gold does not glitter, not all those who wander are lost; the old that is strong does not wither, deep roots are not reached by the frost. -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/CAM-_j9vMnk4%3DQh3FxmhLupcPmEXONJWx8k9Skcd4-8Q7_ik-Og%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
