Barn swallows nest in the barn every year, usually above the chandelier, and the other day I could hear some baby birds cheeping which seemed to come from behind this painting. I noticed that there was also some straw sticking out from behind the painting as well as some bird droppings near the top.
I was concerned that the babies would be stuck too deeply behind the painting so I unscrewed it to check.
The painting is 18" deep so the barn swallows have packed in about 14" of straw for the nest.
The painting has been replaced so the babies are safe.
A week later I checked and and there were three baby birds.
They look suspiciously like starlings.
Back to spat-on eagle painting.