Yesterday at Duck Hollow: A Few Good Birds

Monongahela River valley at Duck Hollow, 12 Nov 2023, 10:30am (photo by Kate St. John)

13 November 2023

Warbler migration is over and waterfowl migration has not yet reached Pittsburgh so at times we seem to be in a birdless state. The Monongahela River at Duck Hollow was in that condition at yesterday’s Duck Hollow outing — a dozen mallards and 1(!) Canada goose — but we found a few good birds in the thickets.

When we arrived the sky was brilliantly blue with some russet trees on the hillsides. Our group of five was so small that we didn’t do go-around-the-circle introductions and I forgot to take a group photo.

Brilliant blue sky, fading leaves, Duck Hollow, 12 Nov 2032 (photo by Kate St. John)

One golden-crowned and three ruby-crowned kinglets bopped around us as we looked up this hill.

Best birds of the day were five purple finches (Haemorhous purpureus) — one male and four females — that were too far for a photograph, so here’s one from Wikimedia. We parsed out the females first: Very brown stripes on chest, wide white eyebrow, brown face, brown head, notched tail.

Female purple finch (photo from Wikimedia Commons)

Then we saw the lone male (again this photo is from Wikimedia). House finches were nearby for comparison. Here’s how to tell the difference –> Purple and House.

Male purple finch (photo from Wikimedia Commons)

Later a northern mockingbird came close for a photo, this one by Charity Kheshgi.

Northern mockingbird, Duck Hollow, 12 Nov 2023 (photo by Charity Kheshgi)

View our checklist online at https://ebird.org/checklist/S154301974 and below.

Duck Hollow, Allegheny County, Pennsylvania
Nov 12, 2023 8:30 AM – 10:15 AM
5 participants, 25 species

Canada Goose (Branta canadensis) 1
Mallard (Anas platyrhynchos) 12
Mourning Dove (Zenaida macroura) 3
Killdeer (Charadrius vociferus) 3
Herring Gull (Larus argentatus) 2
Red-shouldered Hawk (Buteo lineatus) 1
Red-tailed Hawk (Buteo jamaicensis) 1
Belted Kingfisher (Megaceryle alcyon) 1
Red-bellied Woodpecker (Melanerpes carolinus) 1
Downy Woodpecker (Dryobates pubescens) 1
Northern Flicker (Colaptes auratus) 1
Blue Jay (Cyanocitta cristata) 5
Carolina Chickadee (Poecile carolinensis) 3
Ruby-crowned Kinglet (Corthylio calendula) 3
Golden-crowned Kinglet (Regulus satrapa) 1
Carolina Wren (Thryothorus ludovicianus) 4
European Starling (Sturnus vulgaris) 1
Northern Mockingbird (Mimus polyglottos) 3
American Robin (Turdus migratorius) 8
House Finch (Haemorhous mexicanus) 8
Purple Finch (Haemorhous purpureus) 5
American Goldfinch (Spinus tristis) 5
White-throated Sparrow (Zonotrichia albicollis) 8
Song Sparrow (Melospiza melodia) 3
Northern Cardinal (Cardinalis cardinalis) 6

(credits are in the captions)

A Wasp, An Oak, and Indelible Ink

Screenshot from Making Manuscripts: Oak Gall Ink (source video below from the British Library on YouTube)

12 November 2023

Nowadays it’s rare to write anything by hand unless it’s the size of a Post-It note. When we really want to say something we use keyboards and touch screens to generate digital text read on screens or, less often, on paper. Our writing equipment becomes obsolete so rapidly that our computers and cellphones are replaced within a decade. (Who among us is still using the same cellphone since 2013? Do we even remember what model it was?)

So consider this: Humans used the same writing tool, the same indelible ink, from the 5th to the 19th century. When applied to parchment, it is readable 1,700 years later. The ink is easy to make by hand from natural ingredients and is still used in calligraphy today. To make iron gall ink, the process starts with a wasp and an oak.

When a cynipid wasp lays an egg in a developing oak leaf bud, the hatched larva secretes a substance that makes the oak surround it with a gall. The wasp (Andricus kollari) and the oak marble gall below are from Europe but similar wasps and oak galls occur in North America(*).

The outer shell of the gall is rich in tannins whose presence protects the wasp from predation.

Oak marble gall on white oak forced by Andricus kollari (photo from Wikimedia Commons)

When crushed and soaked in water the galls’ tannins give color to the ink.

Oak marble galls on the twig, forced by Andricus kollari (photo from Wikimedia Commons)

Two more ingredients transform the ink for final use: Iron sulfate dissolved in water makes the ink black.

Iron sulfate crystals (photo from Wikimedia Commons)

Gum arabic dissolved in water makes the ink sticky enough to hold onto parchment or paper.

Gum arabic in lumps and powder (photo from Wikimedia Commons)

This video from the British Library shows how iron gall ink is made.

(video embedded from the British Library on YouTube)

Eventually we used paper instead of parchment, even for important documents, and iron gall ink fell out of favor because the acid in iron sulfate makes the paper disintegrate. To solve that problem we invented paper-friendly inks and then computers.

Iron gall ink has oxidized the cellulose, causing the paper to disintegrate (from Wikimedia Commons)

Medieval manuscript creation used natural products from animals, plants and minerals. See the process from parchment to ink to binding in this 6-minute video from the Getty Museum.

video embedded from the Getty Museum on YouTube

Read more at Making Ink From Oak Galls: Some History & Science.

(*) p.s. The amount of tannin varies by type of gall and the tree species the gall came from. Galls with the most tannin work best.

(credits are in the captions)

Seen This Week: Owl, Crows and Deer

Eastern screech-owl, Frick Park, 7 Nov 2023 (photo by Charity Kheshgi)

11 November 2023

Songbird migration is quiet now and birds, when they’re found, are in mixed species flocks.

On 7 November, Charity Kheshgi and I encountered agitated golden-crowned kinglets, tufted titmice and dark-eyed juncos but it took us a while to find what they were upset about. This red morph screech-owl was hiding above our heads in a small oak.

Golden-crowned kinglet, Frick Park, 7 Nov 2023 (photo by Charity Kheshgi)

An exception to the mixed species flocking rule is our “murder” of crows. My guess is that Pittsburgh’s winter crow flock is 90% American and 10% fish crows, but who can tell? They look alike.

In late afternoon crows stage in the trees in Shadyside and Squirrel Hill, then head west at sunset. 6,000 to 10,000 pass by my building on their way to the roost.

Crows staging in Squirrel Hill just before dusk, 10 Nov 2023 (photo by Stephen Tirone)

At sunset black birds in a darkened sky are impossible to photograph but it’s another story at sunrise. Click on the photo below for a closeup of crows in the brightening sky.

Sunrise with crows, 2 Nov 2023 (photo by Kate St. John)

Leaves littered the ground this week and the air was filled with the sound of leaf blowers. 🙁

Fallen red maple leaf, 7 Nov 2023 (photo by Kate St. John)

Most of the trees were bare in Schenley Park by Friday 10 November.

Bare tree touched by sun, Schenley Park, 3 Nov 2023 (photo by Kate St. John)
Most of the trees are bare, 10 Nov 2023 (photo by Kate St. John)

And finally, a reminder that the rut is still in progress and deer are crossing roads. This duo showed up at a Squirrel Hill polling place on Election Day at a place surrounded by roads. So watch out.

Deer at the polling place on Election Day, 7 Nov 2023 (photo by John via Mardi Isler)

(credits are in the captions)

Caught In The Act

Great egret chases a cattle egret that’s carrying a mouse (photo by Wendy Miller via Flickr Creative Commons license)

10 November 2023

“Hey!” says the great egret as it chases the cattle egret. “That’s my mouse!”

Cameras capture birds and animals in surprising ways. A stack of shorebirds. A bobcat on a prickly perch.

tweet embedded from @AubertHeidi1
tweet embedded from @AZStateParks

And deer running from …?

In New Jersey a buck ran through a front yard, jumped over two cars, and miscalculated the landing. Despite that he hopped out of the truck bed and ran away.

video embedded from Fox 26Houston

This month deer are still in the rut and still running into traffic. Caught in the act.

(credits are in the captions)

Sixteen Years!

A Girl Writing; The Pet Goldfinch (painting by Henriette Brown via Wikimedia Commons)

9 November 2023

Today it’s been 16 years since Outside My Window began on 9 November 2007.

Every day I get up very early to write about birds and nature and am sometimes distracted by the birds themselves. The girl above is distracted by her pet goldfinch. This month, for me, it’s been the crows.

Crow on a spire with an added party hat (photo by Ian Shane via Wikimedia Commons, altered by Kate St.John)
Crow on a spire; added a party hat (photo by Ian Shane via Wikimedia Commons, altered by Kate St.John)

My first blog post was Waiting for Tundra Swans but I didn’t have to wait this year. Last weekend I saw 29 at Yellow Creek State Park including these in Mark McConaughy’s photo.

On anniversaries I look back at the past year’s high points. My highest traffic day is usually when the peregrine eggs hatch at the Cathedral of Learning but there were no eggs this year. Instead, the most popular article was a surprise on Friday 7 April with 10,000 views of…

Top articles in the past 12 months include:

I’ve written a lot and I’m still going at it. 5,913 articles since 2007, and you’ve posted 24,308 comments.

Thank you, my readers, for 16 years together at Outside My Window.

You keep me going every day!

(credits are in the captions) bird-thday

Bitternuts, Butternuts

Bitternut hickory nuts (photo by Kate St. John)

8 November 2023

The Nutty Series: Bitternut Hickory & Butternut

Though their names differ by only one letter bitternuts and butternuts are not the same at all.

Bitternut hickory (Carya cordiformis) is one of the most common hickories in southwestern Pennsylvania and easy to identify by its slender sulfur-yellow buds.

Bitternut hickory buds, April 2022 (photo by Kate St. John)

Bitternuts are closely related to pecans and also share the hickory genus with shagbark hickories, pignuts and mockernuts. Unlike the pecan the bitternut tree is rarely cultivated.

The fruit is a very bitter nut, 2–3 cm (0.75 – 1.25 in) long with a green four-valved cover which splits off at maturity in the fall, and a hard, bony shell.

Wikipedia: Bitternut hickory

The “green four-valved cover” turns brown after the nut lies around for a while (see middle nut at top) and indeed the shell is hard and bony. I had to use a hammer to open this one and damaged the perfect nutmeat in the process. You’ll have to imagine it was shaped like a short squat pecan.

Bitternut hickory nut, opened (photo by Kate St . John)

I can tell you from taste-testing that the nut is bitter and astringent. Squirrels avoid these nuts though Wikipedia says that rabbits eat them.


Butternuts (Juglans cinerea), on the other hand, are prized because the nuts taste good.

Butternut in its soft furry husk, similar to a black walnut (photo by Kate St. John)

Butternuts are in the same genus as black walnuts and sometimes called “white walnuts.” The leaf arrangement is so similar that I didn’t realize that I was looking up at a butternut tree — to see warblers — until I saw the nuts on the ground.

Butternut bark and leaves (photo from Wikimedia Commons)

Notice how similar the husks are: butternut on the left, black walnut on the right below. The butternut husk is oblong and fuzzy.

In the husk: Butternut (oblong and fuzzy) next to black walnut (rather smooth) – photos by Kate St.John

As the husk deteriorates (at left) the lumpy nutshell is revealed.

Butternut husk and nut at various stages (photos by Kate St. John)

A cross section of the nut shows the rough exterior and nutmeat inside.

Cross section of butternut with nutmeat inside (photo from Wikimedia Commons)

The butternut’s natural range runs from Maine and southern Ontario to southeastern Missouri and is smaller than the bitternut hickory’s. While the bitternut thrives, the butternut is declining and listed as threatened in some U.S. states and endangered in Canada. Its biggest threat is a fatal disease, butternut canker, caused by a fungus imported with the Japanese walnut. Ironically butternuts are partly threatened by too-easy hybridization with Japanese walnut trees.

Like black walnuts, butternuts are shade intolerant and thrive only when they’re at the top of the canopy or in an open space. Now that I know what a butternut looks like, I’ll pay more attention.

(credits are in the captions)

Are Piebald Birds More Common Now?

Leucistic common grackle, Frick Park, 26 Oct 2023 (photo by Charity Kheshgi)

7 November 2023

Last month at Frick Park Charity Kheshgi and I saw at least three birds with unusual white feathers in their plumage, a condition that labels them “leucistic.”

Leucism refers to an abnormality in the deposition of pigment in feathers. There is some disagreement as to whether the condition is genetic or caused by pigment cells that were damaged during development. Whatever the cause, the condition can result in a reduction in all types of pigment, causing pale or muted colors on the entire bird. Or the condition can cause irregular patches of white, and birds with these white patches are sometimes described as “pied” or “piebald.”

Audubon Podcast: Why Is This Bird Half-White?

This common grackle had white feather patches on his head that were not uniform from side to side.

Leucistic common grackle, Frick Park, 26 Oct 2023 (photo by Charity Kheshgi)

The circle of white dashes around his eyes indicate his eyelashes are white. (Did you know birds’ eyelashes are modified feathers?)

Leucistic grackle zoomed in, white dashes around his eyes (photo by Charity Kheshgi)

In early October we saw a white-faced chipping sparrow …

Leucistic chipping sparrow — white face, Frick Park, 7 October 2023 (photo by Charity Kheshgi)

… and a leucistic American robin in the middle of the month.

Leucistic American robin, Frick Park, 18 Oct 2023 (photo by Charity Kheshgi)

It seems that leucism is more common in robins than in other species — or at any rate I see more of them. Here’s one that was photographed in Missouri.

Leucistic American robin, (photo by Andy Reago & Chrissy McClaren via Wikimedia Commons)

This leucistic male red-winged blackbird, also seen in Missouri, looks like a new species!

Leucistic male red-winged blackbird (photo by Andy Reago & Chrissy McClarren via Flickr Creative Commons license)

Leucistic birds are memorable but are they becoming more common? It seems so to me but I cannot find a scientific study that answers question.

Meanwhile, read more about unusual white feather conditions at Audubon News: Albinism and Leucism.

(photos by Charity Kheshgi and by Andy Reago & Chrissy McClarren via Flickr Creative Commons license. credits are in the captions)

Changing Bird Names Yet Again

Wilson’s warbler (photo from Wikimedia Commons)

6 November 2023

By now you’ve probably heard that a lot of bird names are going to change in the U.S. and Canada.

The American Ornithological Society [AOS] has vowed to change the English names of all bird species currently named after people, along with any other bird names deemed offensive or exclusionary.

NPR: These American birds and dozens more will be renamed, to remove human monikers, 1 November 2023

The AOS can do this because they have jurisdiction over all the bird names in the Americas. Every year they make 5-10 name changes, usually among scientific names due to new DNA research, and we birders cope. This project is larger and will take several years as they change the common English names of 70-80 birds.

Stop Change

My first reaction was typical. I don’t like change unless I instigate it so I thought: “This sounds like an overreaction to the name problem. All the field guides will be out of date(*ummm, they already are). It’ll be an ordeal to change the data when 4-letter bird banding codes, based on the English names, change as well. I don’t want to do this. Stop Change.”

But then I changed my mind because … I made a list of names that will change and began to invent new ones and the new names were better than the old ones. I could see the point. Here are two examples.

The Wilson’s warbler (Cardellina pusilla), pictured at top, has held the same English name for 185 years, though its scientific name has changed five times since it was first described in 1811 by Alexander Wilson. Its current 4-letter banding code is WIWA.

Suppose it’s new name becomes “black-capped warbler” as suggested by my friend Shawn Collins. It’s so much more descriptive! When someone asks, “What is that warbler with the black cap?” the answer is obvious. The new banding code would be BCWA.

The Cooper’s hawk (Accipiter cooperii), doubly named for ornithologist William Cooper, is most often noticed near backyard bird feeders because it eats birds for a living.

Cooper’s hawk looking for prey (photo from Wikimedia Commons)

[The Cooper’s hawk] it is an inconspicuous species. However, since the 1970s, Cooper’s Hawks have commonly nested in suburban and urban landscapes, such that it is likely the most common backyard breeding raptor across North America.

Birds of the World: Cooper’s hawk account

Suppose its new name becomes “backyard hawk.” When someone says, “There’s a hawk in my backyard…” the answer is almost obvious (there are several possibilities). The new banding code would be BAHA.

AOS might not use these suggestions but I’m happy to have found names that are unique and available as well as the proposed banding codes.

So now I’m a bit excited by the prospect of fixing up the people-names.

Meanwhile, learn more about the project at AOS’s English Bird Names Project FAQ and the people behind some of the names at Learn About the People Certain Birds Are Named After.


p.s. Who was Alexander Wilson? According to Wikipedia he was:

  • Born in Scotland in July 1766
  • Held all kinds of jobs: herder, journeyman, peddler, weaver and then…
  • Became a poet, sometimes satirical & incendiary enough to get arrested. One popular poem started a libel suit against him which he countered by blackmailing the libeler.
  • He was living in poverty so he decided to emigrate to America in 1794 at age 27.
  • In the U.S. he taught school for 5 years until he got into a scandal with a married woman.
  • And then he met naturalist  William Bartram who encouraged his interest in birds and painting. Wilson traveled, sketched, painted and described birds. His illustrations and descriptions of 268 birds included 26 which had not been described before. The way he posed the birds inspired other bird illustrators including Audubon.
  • He died in poverty in 1813 at age 47.

When Alexander Wilson got hooked on birds he became a very good observer, illustrator and ornithologist in the final decade of his life (1802-ish to 1813). Wilson’s warbler was named for him 25 years after his death.

Humans are complicated.

(credits are in the captions except for the Stop Change sign formerly used by Pittsburgh Regional Transit to denote a BUS stop change. I used to have that sign hanging in my office.)

Turning Their Backs On Us

Yellow-rumped warbler, Frick Park, 26 Oct 2023 (photo by Charity Kheshgi)

5 November 2023

Some days it seems like all the birds are turning their backs on us. Warbler season is especially challenging because they tend to pose just like the yellow-rumped warbler above. Fortunately The Warbler Guide by Tom Stephenson & Scott Whittle includes a butt-shot for every bird so if you take photographs you can look them up when you get home.

Most birds just happen to be facing away but others, like this hermit thrush, do it intentionally. The thrush was keeping an eye on us while he hid in the shadows with an escape route mapped out ahead of him.

Hermit thrush presents his back and keeps an eye on us, Frick Park, 26 Oct 2023 (photo by Charity Kheshgi)

Kinglets face every which way as they busily flit to find tiny insects. Inevitably they end up in a butt shot.

Ruby-crowned kinglet, Frick Park, 26 Oct 2023 (photo by Charity Kheshgi)

Sometimes we see a new feature of the bird from behind. This golden-crowned kinglet shows a bit of red at the back of his yellow crest …

Golden-crowned kinglet showing a hint of red in his crest, Frick Park, 26 Oct 2023 (photo by Charity Kheshgi)

… as seen in this closeup.

Closeup of golden-crowned kinglet’s head with hint of red in his crest (photo by Charity Kheshgi)

Surprisingly, some sparrows have faces on their back ends as seen in Wes Iversen’s photo of a fluffed up sparrow. Notice how the secondary wing feathers, back, and undertail coverts form eyes, nose and smiling mouth. The photograph is embedded from Wes Iversen’s original here on Flickr.

Bird Butt
The face on the back end of the bird. Fluffed sparrow from behind (embedded photo by Wes Iversen on Flickr)

Check out more of Charity Kheshgi’s and Wes Iversen‘s photos at these links.

(credits and links in the captions)

Burst of Color Before The Freeze

Witch hazel in a garden, 28 Oct 2023 (photo by Kate St. John)

4 November 2023

Throughout October Pittsburgh’s city neighborhoods had not experienced a freeze, even though it was felt in the outlying areas. That changed on the first two days of November with a whisper of snow. We still had fall colors before the freeze. There are brown leaves and bare trees in our future.

At top, landscaping plants are often bred to maximize fall color as seen on a cultivated witch hazel on 28 October.

The oozing “sweat” beads on this polypore mushroom are just the right color for autumn.

Bracket polypore fungus, Schenley Park, 27 Oct 2023 (photo by Kate St. John)

Heavy mist on 29 October clung to ornamental grasses at Phipps Conservatory.

Heavy dew on ornamental grass at Phipps, 29 Oct 2023 (photo by Kate St. John)

Canada thistle (Cirsium arvense) was still blooming last week. Alas, it’s invasive.

Canada thistle still blooming, 27 Oct 2023 (photo by Kate St. John)

The dawn redwoods (Metasequoia glyptostroboides) at Phipps change color before they lose their needles.

Dawn redwood changing color, Phipps, 29 Oct 2023 (photo by Kate St. John)

Fall color was muted on a misty morning in Schenley Park, 29 October.

Panther Hollow Lake on a misty morning, Schenley Park, 29 Oct 2023 (photo by Kate St. John)

(photos by Kate St. John)