Birding is hunting without killing, preying without punishing, and collecting without clogging your home. Take a field guide into the woods and you’re more than a hiker. You’re a detective on a backcountry beat, tracking the latest suspect from Mexico, Antarctica, or even the Bronx. Spend enough time sloshing through swamps or scaling summits or shuffling through beach sand and you inevitably face a tough question: Am I a grown-up birder or just another kid on a treasure hunt?