Here in New York City, the weather is finally starting to warm up. This means I'm finally able to sit outside and enjoy the rare luxury of living somewhere with a backyard. Now, the shared space isn't fancy. My neighbors like to party and leave evidence of that pretty much everywhere. But after I pick up their cans and straighten up the chairs around the fire pit, things don't look half bad. And I can sit and watch the birds in peace. There's a surprisingly diverse variety of avian life on our…