Here's a new one on me: a blue jay eating a house sparrow, and with some relish. If this sparrow was a fledgling, it was pretty well grown. I didn't see how this started, but my impression is the sparrow was predated elsewhere -- or found dead, I suppose -- and brought into this tree. The jay ate half of it before inadvertently dropping it, at which point I went to look at it. But when I retreated, the jay came back to collect the rest of the carcass, and flew off to eat it elsewhere. That reads as a pretty substantial meal to me.
But now I'm fearing that the chickadee nestlings currently being fed in their box are going to have a rough go of it.
