Depending on your teenage years, the mere mention of superlatives could either bring back fond memories or resurrect deeply buried trauma. Either way, forget about all that—these superlatives are nothing like those. Except for having the same titles. And you might have strong opinions about the choices. But hey, at least they're about birds and feelings aren't at stake.   Why give spring migrants superlatives? Well, why not? If you've been observing birds long enough, you start to see clear patterns around spring migration, both in the birds themselves and the people chasing them: when certain birds pass through ; which species get people the most excited; and how distinct field marks, behaviors, and songs comes to define a bird. Taken together, that's more than enough fodder for some superlative action.  So let’s get to it. And in case it wasn't already clear, this list has been created by yours truly based on my own opinions and observations from a lifetime of birding.…