Turns out my window dove is a mother bird, which explains why she sat on her nest all last week through the pouring rain.
As I raised the blind early this morning, I noticed the nest was empty - or so I thought - but did note that the dove had made her nest extra cosy with lots of fluffy padding. As I was looking, she flew back into the tree and started poking around and that's when I saw the fluffy padding move. Fluffy padding enjoyed a breakfast of regurgitated something, which is what's going on in the photo above, before becoming fluffy padding again after being sat on.
Small Things Simple Pleasures