Yet another HN anecdote—I found a sick baby bird a few weeks ago with swollen eyes in northern Michigan, feather loss on its head, a mother bird circling and crying about it. it soon died and I buried it and also put away the bird bath and feeder, I suggest everyone do the same, another article[1] suggested a possible bacteria infection. Baths and feeders are super-spreader locations to these birds.

1. https://www.wlwt.com/article/birds-are-suddenly-dying-whats-...