Heinroth's shearwater is a poorly known seabird in the family Procellariidae. Probably a close relative of the little shearwater or Audubon's shearwater, it is distinguished by a long and slender bill and a brown-washed underside.
Region
Southwest Pacific
Typical Environment
Occurs largely in pelagic waters of the Bismarck and Solomon Seas, ranging around offshore slopes and current lines near high islands. It forages over deep water but may concentrate where upwellings bring prey to the surface. Breeding is suspected on forested volcanic islands with steep terrain, using burrows or crevices. At sea it is typically seen singly or in small groups and is easily overlooked among other small shearwaters.
Altitude Range
Sea level to 1200 m
Climate Zone
Tropical
Ease of Keeping
Beginner friendly: 1/5
Heinroth's shearwater is a small, little-known tropical seabird of the western Pacific, likely related to the little and Audubon's shearwaters. It is recognized by its long, slender bill and a brown-washed underside, giving it a duskier look than similar species. Breeding sites are presumed to be on steep, forested islands in the Bismarck and Solomon Seas, but remain poorly documented. Like many shearwaters, it comes ashore at night to avoid predators.
Temperament
shy and pelagic
Flight Pattern
low over waves with rapid wingbeats and short glides
Social Behavior
Likely nests in loose colonies or small groups, using burrows or rock crevices on steep, forested slopes. Pairs are probably long-term and share incubation and chick-rearing duties. Visits to breeding sites occur at night, minimizing exposure to predators.
Migratory Pattern
Resident
Song Description
Generally silent at sea. Around colonies it gives soft, wailing or chattering calls at night, typical of small shearwaters, used for mate contact and territory.
Plumage
Sooty-brown upperparts with off-white to pale underparts washed brown, especially on the flanks and belly. Underwings are dusky with a faint, paler panel. Feathers appear smooth and sleek, suited to a pelagic lifestyle.
Diet
Feeds on small fish, squid, and crustaceans taken near the surface. Often seizes prey from the water with brief dips or shallow plunges. May associate with predatory fish or dolphins that drive prey upward. Foraging is typically solitary or in small, loose aggregations.
Preferred Environment
Open ocean near continental and island slopes, convergences, and upwelling zones. Frequently works along current edges and around seamounts or steep island drop-offs.
