The birds that come to my porch feeders are birds that do not mind people. They are the usual suburban camp followers-House Finches, House Sparrows. And the common permanent residents such as Jays and Chickadees and Titmice and Carolina Wrens.
I was surprised then to see a Hairy Woodpecker yesterday, not only eating for 20 minutes at the seed feeder, but drinking syrup from the hummingbird feeders.
(The Ruby-throats ignore my feeders. They like the Wendy's Wish salvia better).
Birds adapt. Consider the gulls seen at any landfill. Consider the eagle at Reelfoot Lake who snatches a duck a hunter has shot down before the duck or the retriever can hit the water-
Birds must have inherited this from their ancient ancestors,who survived planetary calamity and extinction by growing smaller and taking to the air. Who doubts that they were once dinosaurs?
I think velociraptors became hummingbirds ,who lost the blood lust but kept the bad temper!