<div dir="ltr"><div class="gmail_default" style="font-size:large;color:#073763">Josh, </div><div class="gmail_default" style="font-size:large;color:#073763"><br></div><div class="gmail_default" style="font-size:large;color:#073763">Sorry to hear about the nest failure. Given how late it is -- and the fact that there are lots of junco juvies about -- this may have been their second clutch of the summer. In these cases with my nest boxes, I generally toss the nest and eggs into the bushes, leaving them scavengers or insects. </div><div class="gmail_default" style="font-size:large;color:#073763"><br></div><div class="gmail_default" style="font-size:large;color:#073763">Birds of the World (BOTW) species account does have some numbers from a study. </div><div class="gmail_default" style="font-size:large;color:#073763"><br></div><div class="gmail_default" style="font-size:large;color:#073763"><span style="color:rgb(35,35,35);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Fira Sans","Droid Sans","Helvetica Neue",sans-serif;font-size:16px">Of 170 nests on territories of 93 males (1989–1993), 29.4% failed before hatching, additional 15.9% between hatching and fledging (</span><span class="gmail-ToggleUp" style="box-sizing:inherit;color:rgb(35,35,35);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Fira Sans","Droid Sans","Helvetica Neue",sans-serif;font-size:16px"><a href="https://birdsoftheworld-org.proxy.birdsoftheworld.org/bow/species/daejun/cur/references#REF56026" aria-controls="ART713899-REF56026-0" style="box-sizing:inherit;color:rgb(0,112,179);text-decoration-style:solid;text-decoration-color:rgba(0,112,179,0.25);background-color:transparent">Ketterson et al. 1996</a></span><span style="color:rgb(35,35,35);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Fira Sans","Droid Sans","Helvetica Neue",sans-serif;font-size:16px">). Mean clutch size was 3.57 eggs ± 0.72 SE; mean number of nestlings in nests in which eggs hatched (hatching success) was 3.36 ± 0.094 SE. In nests that produced ≥1 fledgling, number of fledglings was 3.08 ± 0.112 SE. Of broods followed until independence (2 wk after fledging), mean number of brood members still alive was 2.34 ± 0.156 SE. </span><br></div><div class="gmail_default" style="font-size:large;color:#073763"><span style="color:rgb(35,35,35);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Fira Sans","Droid Sans","Helvetica Neue",sans-serif;font-size:16px"><br></span></div><div class="gmail_default" style="font-size:large;color:#073763">To maintain their population, of course, they need only replace themselves once in their lifetime with another breeding offspring, so there's a lot of attrition along the way for eggs, chicks, fledges, juveniles, etc. <span style="color:rgb(35,35,35);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Fira Sans","Droid Sans","Helvetica Neue",sans-serif;font-size:16px"><br></span></div><div class="gmail_default" style="font-size:large;color:#073763"><br></div><div class="gmail_default" style="font-size:large;color:#073763"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Aug 7, 2022 at 8:05 PM Josh DeSilvey <<a href="mailto:jmdesilvey@gmail.com">jmdesilvey@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi all - This past weekend we witnessed the culmination of a slowly unfolding tragedy as a female Junco abandoned her nest and three eggs that never hatched. She nested for almost three weeks. We were cautious observers of her activity as she built the nest in a wine-barrel planter located on the deck in our backyard. When we realized this Junco chose this planter, we were excited to see what would unfold, even attentively counting down to when the eggs should have hatched. But then that period passed. <div><br></div><div>We grew concerned when she did not return to the nest Saturday evening, though we did see her come and go throughout the day. This morning (Sunday) confirmed our fears when we did not spy her sitting on the nest. Looking up Junco nesting behaviour on Birds Of The World (BOTW; Thanks WOS!!) confirmed that her eggs should have hatched by Wednesday of this past week (8/3). Although the conclusion is still sad, we suspected it was inevitable. In part this post is one of mourning for our Junco (we named her June) and her loss, and not being cautious, careful witnesses to June raising her nestlings. It is also one of inquiry and I wanted to bring it to the Tweeters list for advice. <div><br></div><div>So we have a nest and three Junco eggs. What should we do with it now? Are there agencies (glancing in the Burkes direction) in the Seattle metro area that would want these for research or teaching?</div><div><br></div><div>Should we leave it as is and let what scavengers are around claim it for their benefit? Or when it starts to stink, remove it to the compost bin or green belt behind our home?</div><div><br></div><div>Also, I was curious to find that BOTW does not report failure rates for broods, whether first or subsequent. In general for birds, what are failure rates for broods? What are some causes? Are second or third broods more likely to fail, then earlier ones?</div><div><br></div><div>Thanks for your thoughts and answers. I look forward to reading them.</div><div><br></div><div>Josh DeSilvey</div><div>Mountlake Terrace</div><div><a href="mailto:jmdesiley@gmail.com" target="_blank">jmdesiley@gmail.com</a></div></div></div>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div><font size="4" color="#073763"><span></span>Steve Hampton<span></span></font></div><div>Port Townsend, WA (<span style="color:rgb(0,0,0);font-family:verdana,arial,sans-serif;font-size:13px">qatáy</span>)</div></div><br><div><font color="#073763"><i><br></i></font></div></div></div>