The black-and-white warbler, Mniotilta varia, is a New World wood warbler and the only member of its genus. It breeds all throughout the mid and eastern parts of North America, and is fairly common despite being inconspicuous. It has a very distinctive high-pitched call that sounds uncannily similar to a squeaky wheelbarrow.
My favorite thing about the black-and-white warbler is that its behavior is very similar to that of common nuthatches and creepers. They forage for insects by going up and down and tree trunk and then flitting to the next tree. Interestingly, they've also evolved a black-and-white striped pattern not too dissimilar from nuthatches and creepers, though I don't know whether the convergence is a coincidence.