Pachyptila belcheri
The Slender-billed Prion, *Pachyptila belcheri*, is a delicate, ocean-dwelling seabird belonging to the tube-nosed petrel family. Measuring 25-29 cm (10-11.5 in) in length with a wingspan of 56-62 cm (22-24.5 in) and weighing 100-160 g (3.5-5.6 oz), it sports a distinctive blue-grey upperparts, a clean white underside, and a prominent dark 'M' pattern across its wings, characteristic of many prions. Its most defining feature is its narrow, slender bill, equipped with fine lamellae, setting it...
Exclusively pelagic during its non-breeding season, the Slender-billed Prion inhabits the vast open waters of the Southern Ocean, only returning to subantarctic islands for breeding.
Their diet consists predominantly of small planktonic crustaceans, including copepods, euphausiids (krill), and amphipods, supplemented occasionally by small fish and squid, which they filter-feed or surface-seize.
Slender-billed Prions are primarily diurnal at sea, feeding both day and night, though they are strictly nocturnal at their breeding colonies to minimize predation risks from gulls and skuas. Their foraging strategy is highly specialized, involving filter-feeding using the unique lamellae in thei...
The Slender-billed Prion has a widespread yet localized breeding distribution across various subantarctic islands. Key breeding colonies are found in the South Atlantic on the Falkland Islands (Malvinas), Kerguelen Islands, and Crozet Islands, and in the South Pacific on Macquarie Island, Chatham...
Least Concern
- The Slender-billed Prion possesses specialized comb-like lamellae inside its bill, allowing it to filter tiny planktonic organisms from the water with remarkable efficiency, much like a baleen whale. - Despite its name, its bill is only relatively slender compared to other prions; it still has ...