My fiancee has had ME/CFS for a while now, and because she could not, for the longest time, look at books/screens/… we put a feeding tray in front of her window so she could watch all the birds going by. Here are some images we took over the last half-year.
Hawfinch stretching to look into the room:

Blue Tits and Great Tits come by the most. Sometimes we get Marsh Tits:


A woodpecker:



No. This “classic” design is specifically known to spread desease. Someone posted a study a while ago that links them to a population decline of certain songbirds in the UK.
Modern feeders force the bird to sit next to the food not in it
Thanks for the heads up, I did not know that.
Could you link the study if you can find it? I could not find it after a quick search.I would really like to know how different factors affect this. I think, without knowing, we kinda did some things that might mitigate this to a degree: We normally have very little food in the feeder. It typically is empty after a day or two. Once the feeder is nearly empty we clear the remaining kernels, stuff they don’t like as much (and I guess, the poop with it). Would love to know if this actually helps and if they discussed other factors in the paper.Edit: Just seen the link posted (how did I miss that) and it does answer why my points don’t matter. Don’t use flat feeders ever.
Here you go https://www.rspb.org.uk/whats-happening/news/how-to-help-garden-birds