See Food for a description of the feeding behavior of Wilson's Storm-Petrel. The following description is based on Howell (2012):
"Transiting flight usually fairly low and direct over the water, with no banking or weaving and only short glides, the wings held straight out and not strongly crooked. Wingbeats usually quick, stiff, and fairly shallow, (recalling a barn swallow), the upstroke looking quicker and flicking, the downstroke stronger. In calm conditions, sometimes sustains direct flapping flight 3-5 meters above sea for hundreds of meters. In strong winds, can glide hundreds of meters with little or no flapping, flying in low, long-wave-length arcs much like larger tubenoses. Also 'kicksails' like larger Fregetta storm-petrels, especially when transiting into and across the wind. Birds in heavy wing molt need to flap quicker and appear even more fluttery in contrast to full-winged birds that glide and sail strongly and more easily."
May form rafts on water, often composed of first-year birds (Murphy 1936).
Wilson's Storm-Petrel often follows boats and is attracted to chum slicks.