goldfinch you spotted last November—dull, olive‑streaked, easy to overlook—returns in May transformed into something almost unrecognizable: electric yellow, black‑winged, unmistakable. …
Somewhere right now, a Blackpoll Warbler (Setophaga striata) is crossing the Atlantic Ocean nonstop—a 72‑hour, 2,700‑kilometer flight from New England …