Very cool!!! On Fri, May 7, 2021 at 1:09 PM Steven Brown <sbrow...@gmail.com> wrote:
> > Hey COBirders, > > Not big numbers, but more migrants arrived early this morning. There were > noticeable small birds moving around, unlike all other days so far. > > Best: > > 5 Yellow Warblers, including 2 FOY females > Com Yellowthroat, plus FOY female > FOY Ad M Yellow-breasted Chat > FOY Ad M Bullock’s Oriole > very few sparrows seen today. Maybe the White-crowneds finally vacated. > > 25 birds banded Thursday, 15 Friday. > > A Banding Story….Besides banding passerines to see migrant numbers and > diversity, I also am interested in Site Fidelity. Several of the species I > band at Clear Spring Ranch do nest here, and I can catch them both in > spring when they arrive, and sometimes in August/September before they > depart again. I have many individuals that have been seen spring and fall > over several years! > > One female Yellow Warbler today was banded 5/8/2019 as a second year bird > (hatched in 2018). I recaptured her 5/20/20, and today, 5/7/21. I have not > seen her in the fall yet, so I am not sure if she is nesting here, or > further north somewhere, and just passes through CSR. More to be learned! > > In his new book, Sibley suggests that about 1/2 of each age class will die > each year. (so while species may “mate for life” there is a real good > chance their mate will change several times.) > If she hatched in 2018, 1/2 of her age class was gone by spring 2019, 1/2 > again by 2020 (1/4), and 1/2 again by 2021. So she may be part of 1/8 of > the survivors in her age class, after just a few years. Nevertheless, > assuming she hatched nearby, she has migrated successfully at least six > trips so far, and that’s pretty cool. > > Have a good weekend, > Steve Brown > Colo Spgs > > -- > -- > You received this message because you are subscribed to the Google > Groups "Colorado Birds" group. > To post to this group, send email to cobirds@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/cobirds?hl=en?hl=en > * All posts should be signed with the poster's full name and city. Include > bird species and location in the subject line when appropriate > * Join Colorado Field Ornithologists https://cobirds.org/CFO/Membership/ > --- > 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 cobirds+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/cobirds/B1E66579-8A6A-43A0-976A-85B5608929D7%40gmail.com > . > -- -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To post to this group, send email to cobirds@googlegroups.com For more options, visit this group at http://groups.google.com/group/cobirds?hl=en?hl=en * All posts should be signed with the poster's full name and city. Include bird species and location in the subject line when appropriate * Join Colorado Field Ornithologists https://cobirds.org/CFO/Membership/ --- 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 cobirds+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/CANX5%3DMvmE90p008zmTYEBXUa6UrH5nW6o5vamYrZGgMBw0Keqg%40mail.gmail.com.
