Tag: margaret roach

T.G.I.F. Shivering on demand

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“A bird’s bill is not insulated. Nor are its legs and feet. So all those vulnerability points tend to be smaller in species that winter in cold zones — scaled down as a result of the natural selection process across countless generations.”

Feathers are the first line of defense against weather, Mr. Sibley said in a recent conversation, and besides enabling flight, “they’re streamlining, waterproofing, windproofing, coloration — all those things.” And down feathers, the soft, fluffy kind closest to the bird’s body, he added, are “the most effective insulation known.”

Using tiny muscles where their feathers attach to skin, birds can raise and lower them, thickening the insulating layer around their bodies, he said, “like putting on an extra jacket or getting into a sleeping bag.”

Also thanks to feathers, a bird can tuck in its most vulnerable body parts, particularly overnight. Heads are turned so beaks can be buried into the shoulder-like scapular feathers atop a wing “to reduce heat loss and recycle warmth in the same way people do when breathing into cupped hands,” Mr. Dunne writes. By perching on one leg, the bird can pull the other up into safety, conserving more heat.

Another cold-defying strategy of birds is shivering on demand to raise their body heat — that’s what chickadees do to emerge from torpor.

Small birds lose about 10 percent of their body weight each night year-round while at rest…

— Margaret Roach, from “How Birds Survive Winter Cold” (NY Times, Jan 29 2025)

Photo of Sparrow taken at 6:45 am at Cove Island Park. 22° F, feels like 17° F. Feb 21, 2025. More photos from this morning’s walk can be found here.

Quiet, please. We are not alone.

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Spring unfolds each year in color, yes, but also in sound. And, regrettably, in noise — some of it emanating from our gardens.

When Nancy Lawson, a Maryland-based naturalist and nature writer, speaks about the voices of frogs or birds, she uses the word “sound.” When she refers to humanity’s voice — the din of mowers, blowers and chain saws — she describes it as noise, specifically “anthropogenic noise.”

Her definition: something that is “disrespectful of all the other sounds and runs roughshod over them,” she said, with “often unnecessary rudeness.”

These days, we’re not just driving one another crazy with the racket that fills most neighborhoods. We’re “smothering some of the opportunities for animals to communicate through their senses,” she said, “to perceive the world through their senses.”

That means communications are masked and predator alarms and other critical life cues are stifled.

The challenge she poses for us: “Let’s think about the fact that these are our neighbors, too. And they can’t just run inside and put on noise-canceling headphones.” […]

In other words: Easy does it.

“If you treat the local environment like the homeland it’s meant to be,” she writes in “Wildscape,” “you’ll be exposed to more cultures and ideas and ways of life than if you visited with people from every country in the world.”

Sometimes, she said, that’s not about doing something, but the opposite: Stop mowing so often; stop leaf blowing. “Stop these sensory disruptions,” she said.

Even with actions we know can cause harm, like using pesticides, it’s not just the direct damage that she alerts us to.

“It turns out that putting out scents into the world that cause odor pollution can disrupt flower fragrances, and bees’ ability to find the floral resources that they need,” she said of an often unnoticed violation of the Scentscape.

Noise has unexpected effects, too, like reducing the nesting success of bluebirds and tree swallows, and decreasing the foraging ability of owls and bats.

Or this: As cars drove past, Ms. Lawson noticed a monarch caterpillar flinching upward from the milkweed it was feeding on near her roadside. A paper she found cited the same reaction — and how traffic-stressed animals even bit the researchers, something they had never documented before.

Quiet, please. We are not alone.

— Margaret Roach, from “Quiet, Please: You Are Not Alone in Your Garden”

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