Magnolia Warbler
Have you seen this little one? This Magnolia Warbler is only about 5 inches and weights less than half an ounce! They are migrating from southern Mexico and Central America, on their way to their breeding grounds in northern PA to Canada, so they won't be around too long! Look for their black masks and streaky chest, hopping from branch to branch!
Credit: Bill Moses/USFWS. Original public domain image from Flickr