The Discovery That Made My Stomach Drop

We were unpacking and settling back into our routine when my daughter asked if I could help her clean out her closet. I grabbed a garbage bag, rolled up my sleeves, and pulled back the curtain next to her window.
And then I froze.
Wedged between the blinds and the window frame was a thick, compacted mass of brown, fibrous material — like insulation had exploded and then somehow melted into one dusty, disgusting clump.
My first thought?
Oh no… did we get mold?
My second?
Or did a bird squeeze in and build a nest here?
I leaned closer. My daughter leaned closer. And then we both saw them.
Little black dots scattered through the mess.
Not mold.
Not bugs.
Not dirt.
Droppings.