Fairly common but mainly offshore and rarely seen; breeds on rocky islands where it visits colonies at night. Feeds out at sea, sometimes following ships and fluttering fast and low in the wake (like a bumblebee). Tiny black seabird with rounded tail tip, white rump, and white stripe on underside of wing. In direct comparison, appears about half the size of Leach’s Storm-Petrel, which has much stronger, bounding flight. Winters at sea in South Atlantic.