The Silence of the Wrens

I’m a fan of wrens, in general, and House Wrens, in particular.

Busy, grumpy, and brash, these little birds make a big presence in the yard.

The yard’s House Wrens are attentive and productive parents. (One little male was over-attentive, to the point of feeding nearby cardinal nestlings.) These little birds appreciate the nest boxes I make, which gives me incentive to make more nest boxes. It’s nice to feel like I’m contributing to the cycle.

Photo of a small brown-mottled House Wren perched in mown grass and weeds. The little bird has a vague pale stripe, over and behind its eye, and a slightly down-turned beak, giving it the appearance of frowning.
Perhaps it’s just the eyestripe, but SO GRUMPY.

The House Wren cycle starts each spring, when the males show up. After a bit of territorial wrangling, a dominant male settles in and claims all the wren-sized nest boxes.

All the boxes.

The males add a touch of twig-and-duff bachelor furniture to each box, then they start singing.

Loudly.

Video of House Wren activity, from 2013. A little bit of chasing and arguing, a little bit of nest building, and a lot of singing. Loudly.

Such big songs, from such little birds.

When females arrive, the males go all out. Extra singing. Extra everything, including a high-pitched whistle almost above my hearing range.

The males dash around, showing off their boxes and bachelor furnishings, lingering at their favorite box, switching favorites in a heartbeat if the females favor a different box.

The females mutter and fuss, inspecting each location according to their own private checklist, ignoring the males’ antics. Eventually, one of the females chooses one of the boxes, and the real work of nest construction begins.

The female wrens scour the yard and pollinator beds for just the right materials, in just the right sizes. They stuff their chosen box with twigs and dry grass, moss and spider webs, muttering as they work. Scolding squirrels and photographers who venture too close. Scolding the male wrens, too, if they pop into the box for a glimpse of fresh decor.

The females haul and grumble, while the males twitter and sing.

It’s all very overt and conspicuous.

And then, on some future day, the nest wakes with its own song. A hungry song that grows louder each day.

Video clips from June, 2025, of a House Wren nest box in the yard. Clips start when the nestlings are very small, with very small voices inside the box. The final clips are from days just prior to fledging, when the nestlings have louder, harsher voices and have begun lingering in the doorway, ready to fledge.

Through it all, the male wrens sing.

Loudly.

Photo of an adult House Wren flying away from its nest box. The photo is captured from beneath the box, with bright sunlight filtering through the surrounding leaves of our live oak tree. The bird's wings are spread, primaries translucent against the bright background of sky.
Off for more foraging.

Which is why I surmise that the missing parent, from last June’s nest, was the male.

When I found a little House Wren body, near the nest, time had already erased its cause of death. All that remained were traces of recent life. Feathers. Stiffening limbs. Breathless silence.

The yard’s sudden silence was sad enough, without the knowledge of near-hatching eggs in the nest box.

[Look away or scroll quickly, if you don’t want to see his death photo.]

[It’s not gory. There’s no blood or open body cavities. Even so, I understand that acceptable levels of gore and/or death imagery are best judged by readers, not bloggers. It is, after all, death.]

[It’s the next photo…]

Photo of a fallen House Wren in the yard, surrounded by grass, weeds, leaves, and a few empty peanut hulls left by the squirrels and blue jays. The wren's body is intact, complete with its beautiful mottled-brown feathers.
Poor little dude. Nature is unavoidably brutal.

A quick internet search yielded little information about House Wren nest success, after the death of a parent bird. (Please post in the comments, if you know where such information exists.) Anecdotes abound—stories of successful nests tended by a single parent, stories of abandoned nests, stories of new partner birds destroying eggs and chicks.

While I mulled over anecdotes, the eggs hatched. Playing out a new anecdote, the single un-singing wren hunted and foraged and flitted around the yard, shouldering the work of two.

Soon the pollinator beds were stripped of caterpillars, and the wren was dodging off into nearby yards, expanding her search grid. Further and further she commuted, with longer and longer gaps between visits to the nest.

Photo of a House Wren perched in the doorway of its nest box. Two hungry beaks are waiting in the doorway, gaped open to beg for the morsel of food the parent has brought.
So busy. So hungry.

As I’ve noted before, I’m a hopeless meddler. When the yard’s cycles get disrupted, I try to help.

Only the wren knows whether or not she needed help, but I was determined.

In the end, I opted for supplemental feeding in the form of meal worms.

I first offered dried meal worms (they were the easiest and least expensive option). The little wren never even glanced at my offering. Dried meal worms were not on her family menu.

My next option was live meal worms.

I struggled with empathy, as I spooned meal worms from their pet-store cups into the wren’s dish. The feeder-rack meal worms were, after all, trying to live their own best lives. Who am I, to exercise such control over living things? I have no answers, only a hierarchy of perceived need in which the wrens won that particular moment.

Meal worm empathy aside, now the wren and I were on the same page. Live meal worms, dished up just beneath the nest, were (apparently) a welcome addition to the nestlings’ diet.

Photo of the House Wren taking a meal worm from a glass dish placed at the foot of the live oak tree. The little bird's wings and tail feathers are spread, for balance, as she reaches down into the dish.
Shortening the wren’s commute for food. Calories acquired, calories saved. In the yard, calories are currency.

I couldn’t afford to offer around-the clock meal worm service, nor did it seem healthy for the nestlings. I opted for two or three servings a day, each serving made up of eight or nine small-to-medium meal worms.

After the second day, the wren would see me heading for the shed and pause her work, waiting beside her dish. Not singing. Just waiting.

Photo of a House Wren leaning far out of her nest box, peering downward.
She’s looking at the bowl, in this photo, because she expected a serving of meal worms.
Photo of the House Wren perched on the flared root of a live oak tree, peering into a glass bowl beside the root. The alert little brown-mottled bird was looking for a meal worm meal for herself and her nestlings.
Order up!

The wren fed the meal worms to her nestlings, but not without modification. She had a routine of taking a meal worm from the bowl, smashing it violently against the tree root, then carrying the stunned worm to a nearby row of landscaping bricks, where she did more smashing and bashing, along with some selective dismemberment.

[Nature violence, in the next video, which shows the House Wren’s meal-prep routine.]

Video clips of a House Wren taking meal worms from a glass dish beneath her nest, then prepping the meal worms on nearby landscaping bricks before feeding them to her nestlings.

When the wrens fledged and followed their single un-singing parent away from the yard, I tried to gain some objectivity.

Had I really helped? (Probably not.)

Would the wrens have survived and fledged, without the meal worms? (Probably.)

How would these young wrens learn to sing, without a singing parent? (Good question. Please comment, if you know the answer.)

Of course, I’ll never know if my “help” really helped. I want to believe I helped, in no small part because I want to believe that the meal worms died for a healthy (helpful) purpose.

Photo of a House Wren nestling peering out of the door of its nest box. The little wren already has adult plumage, though it still has the yellow beak margins of a hungry nestling.
Hello world! I’m almost ready to fledge!

All I know, for certain, is that the nestlings fledged and followed their un-singing parent into other adventures, in other yards.

Adventures that may (or may not) be influenced by a taste for (or aversion of) meal worms.

As always, let me know if you see them.

Photo of a House Wren nestling leaning out of the entry hole of its nest box. The nestling is ready to fledge and looks almost like an adult bird, though it still has the bright yellow beak margins of a nestling.
One of the things I most looked forward to, growing up, was the idea of eating all of my favorite foods, all the time. Needless to say, adulthood hasn’t worked out the way I imagined. I wonder if the same is ever true, for birds?

The Rest of the Wren Story

In June of 2015, I noticed that one of the yard’s House Wrens had begun feeding a family of Northern Cardinal nestlings. (Read my initial blog post here.)

Nestling May 30

The adult cardinals, especially the male, were also feeding the nestlings.

Nestling May 31

In that early blog post I wrote, “I wonder if this kind of behavior is common. Have the yard’s birds been feeding each other all along?”

Cardinal May 11

In searching for answers to my question, I ran across the Tough Little Birds blog, run by biologist Katie LaBarbera. I contacted her through the blog, and she replied that the behavior was unusual enough to be of interest to other biologists. Before too long we had a short article ready to submit for publication. After peer review and a few revisions, the article was accepted by The Wilson Journal of Ornithology and can be found in the current (September 2016) issue: House Wren (Troglodytes aedon) provisions nestlings of Northern Cardinal (Cardinalis cardinalis).

And now, as Paul Harvey might have said, it’s time to post the rest of the story…

wren-june-4

Back in June of 2015, while I was searching for answers online, the wrens’ brood hatched. For a few days the male wren stayed busy feeding both nests, dividing his time somewhat unequally in favor of the young cardinals. But something changed as the cardinals neared fledging. The last time I saw the cardinal nestlings accept food from the wren was on June 5th, and the last time I saw him approach their nest was on June 6th. (They greeted his visits on the 6th with silence.) On June 7th, the young cardinals left their nest.

cardinal-june-7

The yard stayed in a turmoil on the 7th, loud with the cries of hungry cardinal fledglings and nervous cardinal parents. (The male cardinal was particularly aggressive with larger birds that day, much to the dismay of a hungry brown thrasher.)

cardinal-june-7

cardinal-june-7

The wren, formerly so devoted to the cardinal nestlings, never approached the cardinals after they fledged. Instead he spent the 7th, and the following days, feeding his own nestlings. The young wrens stayed in their nest box until June 16th and 17th, eating spiders and praying mantises and a variety of other insects brought by their parents.

wren-june-10

wren-june-10

wren-june-10

wren-june-11

wren-june-12

The nestlings grew bigger and bolder each day.

wren-june-13

wren-june-13

And their parents worked harder and harder to keep them fed.

wren-june-16

By June 16th they showed signs of leaving.

wren-june-16

wren-june-16

And on June 17th …

wren-june-17

They were out of the nest box, but they were still hungry!

wren-june-17

wren-june-17

wren-june-17

When they left the yard that evening, I felt bereft. As I always do when the yard’s children move on.

wren-june-17

I wished, as I always do, to follow the fledglings. Or at least to know their futures. Did any of them survive? Have they, perhaps, visited the yard again in the weeks and months since?

wren-june-17

Let me know if you see them.

The Nestlings

Wren May 4

A house wren began claiming the yard’s nest boxes in late April. He spent days on end carrying twigs, working on nests in each of the boxes.

Wren May 4

House Wren April 29

He clearly preferred one of the smaller boxes, and built his most elaborate nest in it. When females showed up to inspect the nests, he led them over and over again to his favorite, as if arguing its attributes.

House Wren April 29

The activity around the wren boxes was so entertaining that I almost missed a developing cardinal nest in the overhanging honeysuckle.

Cardinal May 11

Cardinal May 9

Cardinal May 11

The wren watched the cardinals’ progress with obvious interest, but didn’t seem to object.

Cardinal May 11

The cardinals quickly completed their nest, and soon there were eggs.

Cardinal May 19

May 19

Cardinal May 25

May 25

And then…

Nestling June 1

June 1

When the eggs hatched, the house wren’s interest in the honeysuckle nest increased alarmingly. (More than one source reports that house wrens sometimes destroy nearby nests, pecking holes in eggs and even killing nestlings.)

Nestling May 31

But a closer look revealed that the wren wasn’t planning to harm the nest.

Nestling May 30

He was feeding the brood.

Nestling June 1

And so were the cardinals.

Nestling May 31

I’m confused, but the cardinals, the wren, and the nestlings seem content.

Nestling June 1

Nestling May 31

The cardinals bring seeds, while the wren scours the yard for insects.

Wren May 30

And the nestlings greet either meal with enthusiasm.

Nestling May 31

I wonder if this kind of behavior is common. Have the yard’s birds been feeding each other all along?

Wrens May 3

I suppose “wonder” is the key word here, as it usually is in the yard.

Nestling June 1

The Empty Nest

The house wrens’ nestlings fledged this week. They fledged while I was busy doing other things, and I regret missing the moment of their departure. (For more about the house wrens, see herehere, and here.)

Wren August 4

During the last two months, our little family of birds have been a constant source of amusement and amazement. At first the male worked alone, a tiny bustle of feather and song. Then his mate arrived, bristling with scolds. Together they transformed the nest box into a vessel seemingly immune to the laws of physics. They stuffed it with so many twigs that it should have burst at the seams or collapsed into a singularity. Instead it rocked gently in the wind as eggs were laid, as the first male lost control of the box and his eggs were destroyed, and as he reclaimed the box and eggs were laid again.

Wren August 14

In early August, the eggs hatched.

Wren August 15

Wren August 14

As the nestlings’ voices grew more and more insistent, the wrens again defied physics. They expended so much energy, feeding their young, that both birds should have grown weak and thin.

Wren August 14

Wren August 14

Among the insects I recognized, there were caterpillars, moths, katydids, and crickets.

Wren August 23

Wren August 23

The yard should have run out of insects, but it didn’t.

Wren August 23

Wren August 24

I don’t know how many nestlings they were feeding. More than the box should have been able to hold, wedged in with all of those twigs.

Wrens August 22

Wrens August 22

Wrens August 22

Wrens August 22

Wrens August 22

Then, around mid-morning on August 26th, I found the box abandoned.

I want to believe that I’ve heard the fledglings, in the days since, begging from deep within the wax myrtle, or from the neighbors’ yards, or across the street. I want to believe I would recognize them if they returned to the yard, which seems unnaturally quiet now.

Perhaps they will return next year, all grown up and beyond recognition. Perhaps they will fill the yard, once more, with songs and scolds. Fill the nest box with twigs and eggs, and, in the process, fill me with more delight than I should be able to hold.

Fall Webworms

Pear Leaf Aug 2

Earlier this month I noticed a few silk-encased leaves on the pear tree. I suspected the webs were the work of Eastern Tent Caterpillars, because I had found a few of these caterpillars under the pear tree last summer.

Last summer’s caterpillars never caused a problem in the tree, but this year the tree sprouted more and more webs.

Pear Leaves August

This afternoon I typed “tent caterpillar” into my web browser and within a few clicks discovered I was on the wrong track. It’s the wrong time of year, and our webs are located at the ends of branches rather than near the trunk. So these are not Eastern Tent Caterpillars. Instead, I believe they are Fall Webworms.

Caterpillars August

(My caterpillar identification process is not very scientific, consisting mostly of browsing the internet and trying find something that looks like my photos. Please comment if you can correct or confirm my identification!)

Caterpillars August

The caterpillars are not doing much damage. There are only six or seven webs, confined to the lowest branches on one side of the tree. The affected leaves are being eaten, but they represent a very small proportion of the tree’s total leaf count.

Caterpillars August

Caterpillars August

Even though our tree is not suffering, several nearby trees are completely shrouded in webs. As I’m reluctant to test the health of our pear tree, I’ve trimmed its most heavily webbed branches and opened the remaining webs as recommended.

Caterpillars August

I don’t know if the House Wrens will eat these caterpillars, or if they’ll leave them for other birds. But if they do eat the Fall Webworms, my work should make feeding their hungry nestlings a little easier.

Wrens August 22