The root of this problem is that there are too many of us who want to experience being alone in the wilderness without actually being alone in the wilderness. Birds (and most of the animal kingdom) are more adaptable than people, there is a man-made pond surrounded by a small community park a block from my house and several species of birds spend time there in spite of the dozens of people who walk their dogs all around it every day and students from two elementary schools at recess and lunch hours. Our biggest wildlife problem is the rabbits that eat flowers and vegetables from neighbourhood yards, if there were a couple of stray dogs in the area there might be fewer rabbits and the stray dogs would be less likely to defecate and urinate on my front lawn within a leash-length of the sidewalk than the people-accompanied dogs.
I grew up on the edge of civilization (some would say we were more uncivilized than our surroundings, but that's a different story
), so as long as I was content with seeing bears, moose, elk, lynx, hawks, geese, herons, grouse, chipmunks, rabbits, crows and sparrows, I never had to go any further than I could pedal my bike. But none of these wild animals cared for my company, so they never stuck around long enough to model for me. If I want to be a serious wildlife photographer, I have to be prepared to get as far away as possible from other people and spend many hours pretending to be a tree, rock in the water or mound in the grass. Or I can go to a park or zoo and spend time with animals that have acclimatized to people and their pets (and it is people, not dogs that present the biggest challenge), with the result that my photos will be totally unsuitable for National Geographic.