Red-breasted Nuthatch Irruption
As a rule, most Red-breasted Nuthatches winter within their breeding range. Irruptive movements southward typically occur every two to four years when conifer cone production on breeding grounds is poor. This fall’s numbers confirm that it is a banner year for Red-breasted Nuthatches in the Northeast, due to their irruptive flights south.
The large number of Red-breasted Nuthatches at our feeders come as no surprise, as this year’s winter bird forecast by Ron Pittaway predicted a Red-breasted Nuthatch irruption due to the poor spruce seed crops in much of the eastern boreal forest. Even so, the numbers are impressive, as you can see from Ken Kaufmann’s (Audubon’s Field Editor) comparison of eBird’s September 2017 and September 2018 Red-breasted Nuthatch sightings.
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Winter Finch Forecast: Finch Irruption This Winter
Things are looking up for those of us who look forward to winters when boreal finches come south in relatively large numbers in search of food. This is an irruption year for winter finches in the East due to the poor cone and birch seed production in northern Ontario and Quebec. Seed-eating birds such as finches, grosbeaks, redpolls and siskins will be frequenting our feeders.
Even at this early date, Evening Grosbeak sightings are up noticeably. Pine Grosbeaks will be taking advantage of good Mountain-ash berry and cone production in New England. Purple Finch numbers should also be healthy this winter. While Red Crossbills sightings may be scarce, White-winged Crossbills sightings may well be up due to the poor cone crops in the eastern boreal forest. Both Common and Hoary Redpolls should be numerous this winter due to poor crops of birch, alder and conifer seeds further north.
In addition to these finches, large numbers of Blue Jays, Red-breasted Nuthatches and Bohemian Waxwings are predicted due to poor nut, conifer seed and berry crops, respectively, further north. (Ron Pittaway’s Winter Finch Forecast, 2018-2019, http://jeaniron.ca/2018/wff18.htm ) (Photo: Common Redpoll)
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The Nuthatch Name
Have you ever thought about the derivation of the Red- and White-breasted Nuthatch’s common name? It comes from their habit of wedging a nut, acorn, etc. into a tree’s bark, and by repeatedly striking the nut, “hatching” or exposing the seed within it.
Many of these seeds are then stored in bark furrows for later consumption. In one study it was found that nuthatches spend more time caching husked than unhusked seeds (71% of sunflower seeds cached were husked). This inevitably would lower the expenditure of energy and time spent when consuming the cache later in the season. Hiding time, and time and distance flying from feeders to cache sites were longer when nuthatches hoarded husked than unhusked seeds, perhaps indicating their increased value to the birds. (photo: White-breasted Nuthatch with husked sunflower seed)
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