This is a quick study that I did a while back of one of those old-fashioned birdfeeders that no one sells anymore. If I were a bird, I'd be rather finicky.
Nowadays, the best sellers look something like this:
What happens with the above, is that the birds are all competing with each other , as well as with the squirrels, for their food. If I were a bird, I'd be timid, since that's my human personality, and I'd hate to have to fight for my food.
So birdies, come to my little birdie home and I'll welcome you with lots of sunflower seeds!