[Mnbird] wren behavior

[Susan Kennedy]

For many years, wrens have nested in a box by my front porch. They fledged about 10 days ago, and usually they have a second family in a box in my backyard. I presume they are working on the second batch now. However, for the last few days when I am sitting on the front porch, the male wren has made many very quick trips into the more recently vacated box in front. He is not carrying any new nesting materials in, but goes into the box for a few seconds and then out again. At least one day, he did this about 20-30 times. Other days for fewer trips.
What do you think is the purpose of these visits?Susan in SW Mpls.
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