Black-capped Petrel vs Barolo Shearwater

Black-capped Petrel

Pterodroma hasitata

How to recognise a black-capped petrel?

General Appearance

The Black-capped Petrel is an elusive seabird characterized by its striking coloration and streamlined body. It has a distinctive contrasting black cap extending over the nape with a prominent white forehead. The bird's back and upper wings are dark grey to black, while the underparts are predominantly white, creating a beautiful contrast during flight. A notable white rump patch and underwing pattern with dark edges make it recognizable from below. Its long, narrow wings are adapted for dynamic soaring, and a short tail adds to its sleek profile.

Male vs Female

There is little to no sexual dimorphism in the Black-capped Petrel, meaning males and females appear very similar in size, shape, and coloration. Both sexes share the same distinctive plumage features, making it difficult to differentiate between the two based solely on physical attributes.

Juvenile

Juvenile Black-capped Petrels exhibit similar plumage to adults with some variances in shading and feather condition. The primary differences may include slightly duller coloration and less distinct boundaries between black and white patches, particularly on the wings and cap. As juveniles mature, they acquire the clearer, more sharply defined markings of adult plumage. Juveniles may also display less worn plumage as they have yet to face the wear and hardships of migration.

Size

15.7 - 18.1 in/12.9 - 14.3 oz

Habitat

Primary habitat

The Black-capped Petrel primarily inhabits subtropical and tropical marine environments, preferring steep cliffs and high seas of the Caribbean region. They are mainly found in the North Atlantic Ocean, nesting on forested slopes of remote islands such as Hispaniola. This seabird thrives in warm, humid climates with a suitable mix of marine and moderately forested ecosystems.

Additional range

Though primarily marine, Black-capped Petrels occasionally forage in diverse oceanic areas, adaptable to varied pelagic conditions. They may be spotted during migration over the northern and southern Atlantic zones, demonstrating their capability to navigate vast marine stretches well beyond their conventional habitat.

Range Map

What do black-capped petrels like to eat?

Natural diet

In the wild, the Black-capped Petrel subsists primarily on a diet rich in marine resources. It favors small fish, squid, and various crustaceans found near the ocean surface. Occasionally, the bird may consume zooplankton and a variety of soft-bodied invertebrates it encounters while foraging offshore. Although it is predominantly piscivorous, the availability of food can vary with seasons, often peaking in abundance during breeding periods when these birds require more energy reserves.

Bird feeders

The Black-capped Petrel is not typically seen at backyard bird feeders, as its dietary habits are more closely aligned with oceanic environments rather than terrestrial ones. It does not usually consume seeds, suet, or fruits commonly offered in these settings. Instead, the species' feeding behavior is adapted to open-sea foraging, making bird feeders irrelevant to its primary nutritional requirements.

There's more to learn about Black-capped Petrel

View full details

Barolo Shearwater

Puffinus baroli

How to recognise a barolo shearwater?

General Appearance

The Barolo Shearwater is a small seabird, typically measuring about 27-30 cm in length with a wingspan ranging between 67-72 cm. Its plumage is predominantly black and white, with the upper parts including the back and wings being a rich black while the underparts, including the belly and underwings, are a bright white. A distinct and thin black band runs across the leading edges of the wings, visible in flight. Their beak is slender and dark gray, complementing their small rounded head. Legs and feet are also dark, often having a slightly bluish tint.

Male vs Female

The Barolo Shearwater shows no significant sexual dimorphism as both males and females have similar size and plumage. This similarity in appearance makes it challenging to distinguish their sexes visually in the wild. Observations during the breeding season might provide slight variations in behavior rather than physical characteristics. Hence, both sexes are equally involved in nesting duties, including incubation and feeding of the chicks.

Juvenile

Juvenile Barolo Shearwaters differ slightly from adults primarily in the sharpness and intensity of their plumage colors. Younger birds may appear duller with a less distinct contrast between the black and white areas. The feather edges in juveniles often have a slightly frayed look as they transition into adult plumage. As they mature, they quickly take on the brighter and more defined coloration seen in adults. However, there are no drastic changes in size or shape between juveniles and adults.

Size

11.0 - 13.0 in/6.0 oz

Habitat

Primary Habitat

The Barolo Shearwater primarily inhabits subtropical and temperate marine environments. They are typically found around the Canary Islands, Azores, and Madeira. These seabirds prefer open oceans and coastal waters, especially during breeding periods, where they nest in cliffs and rocky shores to take advantage of sea breezes for effortless take-off.

Additional Range

Though mainly found in the Atlantic near their breeding grounds, Barolo Shearwaters have been spotted in less expected areas like the North Sea and off the western coasts of Africa. This indicates their adaptability and occasional ventures outside subtropical zones, possibly driven by changing food availability or migratory patterns.

Range Map

What do barolo shearwaters like to eat?

Natural diet

The Barolo Shearwater primarily feeds on small fish and squid found in their marine environment. Their diet largely consists of forage fish such as anchovies, sardines, and other small shoaling species. During the breeding season, they may also consume crustaceans and plankton available in the Atlantic Ocean. These birds are adapted to plunge-diving and surface-seizing techniques to catch their prey. Seasonal variations in their diet occur, as they travel across different ocean regions, yet small fish remain the core component.

Bird feeders

Barolo Shearwaters do not typically visit terrestrial bird feeders. As marine birds, their dietary habits are not well-suited for land-based feeder offerings like seeds, fruits, or suet. Their nutritional needs are met via their oceanic diet, which provides essential proteins and oils. Consequently, setting up a conventional bird feeder would not attract these seabirds. However, preserving their natural habitats and ensuring healthy ocean ecosystems are crucial for their sustenance. Efforts to keep coastal and marine areas free of pollution and disturbances can indirectly support their dietary needs.

There's more to learn about Barolo Shearwater

View full details

Black-capped Petrel

Tap To compare

Barolo Shearwater

Black-capped Petrel

Pterodroma hasitata

General Appearance

The Black-capped Petrel is an elusive seabird characterized by its striking coloration and streamlined body. It has a distinctive contrasting black cap extending over the nape with a prominent white forehead. The bird's back and upper wings are dark grey to black, while the underparts are predominantly white, creating a beautiful contrast during flight. A notable white rump patch and underwing pattern with dark edges make it recognizable from below. Its long, narrow wings are adapted for dynamic soaring, and a short tail adds to its sleek profile.

Male vs Female

There is little to no sexual dimorphism in the Black-capped Petrel, meaning males and females appear very similar in size, shape, and coloration. Both sexes share the same distinctive plumage features, making it difficult to differentiate between the two based solely on physical attributes.

Juvenile

Juvenile Black-capped Petrels exhibit similar plumage to adults with some variances in shading and feather condition. The primary differences may include slightly duller coloration and less distinct boundaries between black and white patches, particularly on the wings and cap. As juveniles mature, they acquire the clearer, more sharply defined markings of adult plumage. Juveniles may also display less worn plumage as they have yet to face the wear and hardships of migration.

Size

15.7 - 18.1 in/12.9 - 14.3 oz

There's more to learn about Black-capped Petrel

View full details

Barolo Shearwater

Puffinus baroli

General Appearance

The Barolo Shearwater is a small seabird, typically measuring about 27-30 cm in length with a wingspan ranging between 67-72 cm. Its plumage is predominantly black and white, with the upper parts including the back and wings being a rich black while the underparts, including the belly and underwings, are a bright white. A distinct and thin black band runs across the leading edges of the wings, visible in flight. Their beak is slender and dark gray, complementing their small rounded head. Legs and feet are also dark, often having a slightly bluish tint.

Male vs Female

The Barolo Shearwater shows no significant sexual dimorphism as both males and females have similar size and plumage. This similarity in appearance makes it challenging to distinguish their sexes visually in the wild. Observations during the breeding season might provide slight variations in behavior rather than physical characteristics. Hence, both sexes are equally involved in nesting duties, including incubation and feeding of the chicks.

Juvenile

Juvenile Barolo Shearwaters differ slightly from adults primarily in the sharpness and intensity of their plumage colors. Younger birds may appear duller with a less distinct contrast between the black and white areas. The feather edges in juveniles often have a slightly frayed look as they transition into adult plumage. As they mature, they quickly take on the brighter and more defined coloration seen in adults. However, there are no drastic changes in size or shape between juveniles and adults.

Size

11.0 - 13.0 in/6.0 oz

There's more to learn about Barolo Shearwater

View full details

How to tell the Black-capped Petrel from the Barolo Shearwater

Visual differences

Black-capped Petrels, larger at 16-18 inches in length and weighing 12.9-14.3 ounces, have a prominent black cap and white underparts with distinctive black-and-white wing patterns. In contrast, Barolo Shearwaters are smaller, at 11-13 inches and 6 ounces, with softer black-and-white coloration and less stark contrast. The Petrel's beak is typically more robust, whereas the Shearwater's is slender. Barolo Shearwaters appear more streamlined, and their plumage is less sharply defined than the Petrel’s more contrasting patterns.

Key differences and behavior

Black-capped Petrels and Barolo Shearwaters exhibit distinct behaviors and habitats. Both engage in nocturnal activities, navigating via stars, yet Black-capped Petrels cover much larger distances in tropical marine environments, especially around the Caribbean's rugged cliffs, while Barolo Shearwaters inhabit subtropical and temperate marine zones, like the Canary Islands. They both form monogamous pairs and share nesting responsibilities, but Black-capped Petrels prefer isolated highland nests, whereas Barolo Shearwaters can nest closer to more populated areas. Both species primarily consume small fish and squid, though their foraging techniques adapt to different marine settings. Notably, the Black-capped Petrel is larger at 40-46 cm and 365-405 g, compared to the smaller 28-33 cm and 170 g of the Barolo Shearwater.