Amy Batog
blue jays part 2: why are they chipping paint off my house?
21.07.2023 - 22:58 / awaytogarden.com
RAT-TAT-TAT. And then again, from outdoors, on the front of the house. It’s far too early for the annual woodpecker ritual of drumming to assert territory; it’s winter, not breeding season. Was the same squirrel who’s been gnawing on the furniture on my back porch shifting focus (and had he somehow developed a rhythmic action to produce that sound)?I sat in wait, determined to find out. The answer was a bit of a surprise:
It was a blue jay. And a few feet away, watching from a branch as the first bird chipped paint off a column on the porch, three companions cheered her on, as if awaiting their turns at bat.
But why? Maybe Google will know.
Though the original articles it refers to—from “Bird Watcher’s Digest” and Cornell Lab of Ornithology’s former membership publication “BirdScope”—are more than 10 years old and not online, this synopsis on Project FeederWatch provides the basic explanation:
Limestone, a source of calcium, is often an ingredient in paint (especially pale-colored latex paint birds prefer, apparently). The theory is that blue jays in the Northeast and Eastern Canada may collect and cache calcium in anticipation of increased needs in nesting season. Songbirds can’t store sufficient calcium in their bodies, and look to natural sources like snail shells, isopods including pill bugs and millipedes, and even earthworms—none of them easy to find right now.
(A related topic: In areas of high acid rain, those natural calcium sources have dwindled even when it’s not winter, posing a risk to nesting forest birds, such as ovenbirds, as appropriate habitat diminishes.)
How to discourage paint-chipping? Offer egg shells, the various online threads suggest, specifically after sterilizing them by boiling or heating in a 250F
The website greengrove.cc is an aggregator of news from open sources. The source is indicated at the beginning and at the end of the announcement. You can send a complaint on the news if you find it unreliable.
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