Wind defines its flight. Leach's storm petrel is a storm petrel from the northern hemisphere. That sometimes finds its way to New Zealand. It is a dark brown bird with a pale rump and a deeply forked tail. The rump is white with a dark stripe down the centre. The bird is small, dark, and fast. The silhouette is distinct. The movement is quick. The presence is fleeting. It does not linger. It passes through. Feeding involves small crustaceans and fish. The bird plucks them from the surface. It patters across the water with feet tapping. Wings are held high. A storm petrel feeding looks like it is walking on water. It is a neat trick. The illusion is complete. The technique is efficient. The prey is secured. The energy cost is low. The survival depends on this method. Flight is erratic and bat-like. Rapid wingbeats alternate with sudden banks. A Leach's storm petrel in a storm is in its element. It rides the wind. It tilts from one gust to the next. The turbulence is not an obstacle. It is a resource. The bird uses the air. It does not fight it. The control is innate. The mastery is real. Breeding takes place on remote North Atlantic and North Pacific islands. The burrow is dug into soft soil on a steep slope. A single white egg is laid. Both parents share incubation duties. The chick is fed on regurgitated crustacean oil. It fledges at about two months. The cycle is timed. The departure is abrupt. The silence returns. The colony empties. These birds are among the most abundant seabirds in the northern hemisphere. Millions breed on islands off Canada, Iceland, the UK, and Russia. They nest in burrows. They return at night. The colonies are enormous. The noise is pervasive. The smell is strong. The density is high. The scale is impressive. The presence is overwhelming. In New Zealand, they are rare vagrants. Most records come from the Tasman Sea and the west coast of the South Island. Birds have crossed the equator. They journey from the North Pacific to the South. It is a long way for a small bird. The distance is significant. The occurrence is accidental. The sighting is notable. The effort is immense. The species is named for William Elford Leach. He was a nineteenth-century zoologist. He described many species. His name lives on in this bird. The tribute is permanent. The recognition is scientific. The legacy is avian. The connection is historical. The call is a series of purrs and chatters. It is heard only at night. On islands in the North Atlantic, the sound is constant. In New Zealand, it is rarely heard. The auditory landscape is defined by this voice. It persists. The communication is simple. It marks the location. The presence is marked. Several subspecies exist. They breed in different oceans. The birds that reach New Zealand are probably from the North Pacific population. They have come a long way. The origin is likely. The identification is probable. The journey is confirmed. Leach's storm petrel is not well known in New Zealand. It is a bird of the northern hemisphere. A visitor from far away. It does not stay. The transient nature is defining. The presence is brief. It carries on.