Summertime

 In summer, the song sings itself.

-- William Carlos Williams

Since I last wrote, we've had a roller-coaster month of May. There were days of rain so heavy it flooded my favorite walking trail. There were days that were much colder than usual, including one when I needed to protect my plants from possible frost. Then it turned hot and very, very dry. My husband and I did some traveling. I was downsized out of a job. Many of my early plants bloomed and faded, only to be replaced by others including the rhododendron, the irises and the peony. I accomplished several big garden projects - including weeding, creating a border trench, and removing and replacing deer netting and fencing - to my physical detriment. The lawn grass became very long but it was cut before any pregnant deer would want to drop a fawn on the lawn, which has happened in the past around now.

Rhododendron (Margo D. Beller)

And spring migration came to an end.

It is always with sadness that I acknowledge it's over. I think of what birds I found and what I didn't find. In my part of New Jersey the northerly winds in late April into early May seemed to have kept down the number of migrants passing through. The radar I looked at showed the birds flying north, bypassing most of my state, taking the path of least resistance. When we visited family in New Hampshire and stayed at a motel by Lake Sunapee it was a pleasure to sit on the screened deck at dawn and listen to the birds I had missed in my area. Except for our annual trip to Old Mine Road to listen for the birds that breed in the high terrain of the northwestern part of New Jersey, the only birds I have found lately are local breeders.

When it finally became warm enough I planted my pepper seedlings and moved the house plants to the enclosed back porch. In the backyard I went from two seed feeders and one suet feeder to one seed feeder and the hummingbird feeder. But there were nights it got cold and one when it got very cold, and that night I covered the pots and the peony, which had flower buds about to open. 

Peony, when the buds opened (Margo D. Beller)

Now, on Memorial Day, the so-called start of summer, it is hot. Yesterday I took in the last seed feeder and washed it out. Until then it had been drawing pairs of white-breasted nuthatch, cardinal, jay, goldfinch, house finch and song sparrow, the last one an unusual feeder bird for my yard. Now, the yard is quiet except for resident birds including the catbird. The birds should be either sitting on eggs or ready to do so.

That brings me to the annual saga of the yard house wren.

Every year the story is different. This year I hung the nest box in a different area of the dogwood tree than last year. In the past it only took a few days for a bird to come. But with this year's winds it took several weeks for a house wren to even show up in the yard, much less investigate the box. Early in May, just before we went on vacation, I saw a wren with a stick in its mouth go into the box. If it was a male, it was "dressing" the potential nest site to show its mate. Its mate would decide if she liked the location. If she did, she would bring in more sticks to create the nest. So I don't know if the wren was a male or female because they look alike.

My favorite walking path under water after
two days of very heavy rain. It has
since dried. (Margo D. Beller)

Fast-forward 10 days. I returned to work only to learn I and a number of others were out of a job. I spent time on the porch. What I saw from there were two house wrens actively shuttling back and forth with food to the box. According to the Cornell Ornithology Lab, incubation is nine to 16 days and the nesting period is 15 to 17 days. Maybe I had misjudged when the nesting period began?

Then, something happened.

We had a few cold mornings, including that very cold morning I mentioned when I had to protect my plants. The shuttling stopped. I didn't see much of the wrens. Recently, as I listened to the male singing from a nearby bush, the female came out of the nest box. But there was no active shuttling. She would return with food and go back inside. She would not come out again for a long time. 

I have no camera in the box so I can only guess at what is happening. 

Scenario 1: The young they had been actively feeding got big enough to fly, left the nest and the pair started a second brood.

Scenario 2: Something killed the young - the cold, a predator - and the pair immediately started a new brood.

Scenario 3: This is an entirely different pair of house wrens.

Wren box in its 2023 location
(Margo D. Beller)

In all the time I've put out a nest box I have never had a pair of wrens have one brood, raise the young, get them to leave the nest and hunt for themselves, and then the pair start a second brood. There would not have been enough time for that process, or for an entirely new pair of wrens to have found the box and lay eggs.

I lean toward scenario 2. Most likely the young had grown too big for the female to get inside the box and sit on them when the temperature dropped to the low 30s and so they died of the cold. Less likely is a predator getting to the young. One of the advantages the nest box provides is the small opening - too small for a cowbird to drop in an egg or admit a predator any larger than an extremely small snake. 

However, it would not have deterred disease from entering and sickening the young birds fatally. That's another possiblity.

At present I go outside in the morning when it is cool. I hear the male wren singing his territorial song. The female appears with food and goes into the box. After a while, when the male sings, perhaps telling her it is safe to do so because he is nearby, she will leave the box to hunt and then fly back and enter the box. The male stays in the area.

Perhaps in a week the pair will be shuttling to and from the box to feed young. This summer I'll have more time to watch for it.