The Kermadec petrel is a species of gadfly petrel in the family Procellariidae. It is 38 cm long with a wingspan of 100 cm. It is polymorphic, with light, dark and intermediate morphs known. It eats squid, fish and other marine creatures.
Region
Tropical and subtropical Pacific Ocean
Typical Environment
Primarily pelagic, ranging widely over warm open oceans far from land outside the breeding season. Breeds on remote oceanic islands with cliffs, slopes, and coastal terraces, often with sparse vegetation. Nests are placed in shallow burrows, rock crevices, or under dense vegetation, typically in predator-free or managed colonies. At sea, it frequents productive waters, frontal zones, and areas of upwelling, sometimes following ships for offal.
Altitude Range
Sea level to 700 m
Climate Zone
Subtropical
Ease of Keeping
Beginner friendly: 1/5
This gadfly petrel is notably polymorphic, occurring in light, dark, and intermediate morphs within the same colony. It soars effortlessly over vast ocean distances and is mostly silent at sea, becoming vocal only at night around breeding sites. It was once lumped with related forms such as the Trindade and Herald petrels, which are now generally treated as separate species.
Adult Kermadec petrel
Temperament
pelagic and wary near colonies
Flight Pattern
dynamic soaring with swift arcs and short rapid wingbeats
Social Behavior
Breeds colonially on isolated islands, forming long-term monogamous pairs. Nests in burrows, crevices, or under vegetation, with both adults sharing incubation and chick-rearing duties. Most colony activity occurs at night to avoid predation.
Migratory Pattern
Partial migrant
Song Description
At colonies it gives wailing, cackling, and moaning calls, mostly at night. At sea it is generally silent.
Plumage
Polymorphic: light morph shows white underparts with dark cap and contrasting dark underwing edges; dark morph is mostly sooty-brown with slightly paler underwing coverts; intermediates show varying white on belly and underwing. Upperwings are typically darker with a subtle 'M' pattern across the back and wings.
Diet
Feeds mainly on squid, small fish, and crustaceans taken from the surface or just below it. It employs surface-seizing, dipping, and occasional shallow plunges. It will sometimes scavenge fishery discards behind vessels and may gather in loose feeding aggregations over productive waters.
Preferred Environment
Forages over deep oceanic waters, convergence zones, and areas of upwelling where prey is concentrated. Rarely approaches shore except during the breeding season or when following boats.
