A warm Atlantic breeze presses salt into your hair as a small group steps off the minibus and onto a black sand beach under a wide, low sky. Headlamps are muted to red; the shoreline is quiet except for the hush of waves and the whisper of sand settling as a dark, armored shape slowly digs a pit. On this guided turtle tour in Boa Vista you watch the methodical ritual of a loggerhead laying eggs, or later in the season, the frantic sprint of hatchlings to the sea — each moment held under the steady eye of an experienced guide.