Little Shearwater
Puffinus assimilis
A small, pale-faced shearwater with the separation line between black and white on the face passing through or above the eye. Mainly sedentary and relatively shy, feeding farther offshore than similar seabirds. Winter breeding birds mainly found around the Kermadec Islands, off southwest Australia, and off the northeastern coast of the North Island of New Zealand. The Fluttering Shearwater can be distinguished by its larger size, smudgy brown underwing, dark face, and tendency to congregate in flocks much closer to shore.
Identification
This shearwater has the typically "shearing" flight of the genus, dipping from side to side on stiff wings with few beats, the wingtips almost touching the water, though in light winds it has a more flapping flight than that of its larger relatives. In flight it looks cross-shaped, with its wings held at right angles to the body, its colouration changing from black to white as the black upperparts and white underparts are alternately exposed as it travels low over the sea.<p>At 25–30 cm (9.8–11.8 in) in length with a 58–67 cm (23–26 in) wingspan, it is like a small Manx shearwater but has proportionally shorter and broader wings, with a pale area on the inner flight feathers. Its bill is more slender than that of Manx, and its dark eye stands out against the surrounding white area.
Taxonomy
mtDNA cytochrome b sequence data indicate that the former North Atlantic little shearwater group (Boyd's shearwater, P. boydi and Barolo shearwater, P. baroli) is closer to Audubon's shearwater (Austin 1996, Heidrich et al. 1998), (although many taxonomists now consider them to be distinct species), and Rapa shearwater (P. myrtae), being closer to the Newell's and possibly Townsend's shearwater (Austin et al. 2004). Heinroth's shearwater was also sometimes considered a subspecies of this bird; the relationship between the little and Audubon's shearwater is probably not as close as long believed (Austin 1996, Heidrich et al. 1998, Austin et al. 2001, but see also Penhallurick & Wink 2004, and Rheindt & Austin 2005). The subantarctic shearwater was also considered conspecific (Onley & Scofield 2007, Gill et al. 2010)
- Scientific name
- Puffinus assimilis
- Authority
- Gould, 1838
- Order
- Procellariiformes
- Family
- Procellariidae
- Genus
- Puffinus
Range and habitat
It breeds in colonies on islands and coastal cliffs, nesting in burrows which are only visited at night to avoid predation by large gulls.
- Migration
- Complete migrants
Behavior
This is a gregarious species, which can be seen in large numbers from boats or headlands, especially on migration in autumn. It feeds on fish and molluscs. It does not follow boats. It is silent at sea, but at night the breeding colonies are alive with raucous cackling calls.<p>It nests in cavities located in grassy fields or in those found among rocks.<p>The little shearwater usually produces a clutch of one clear white egg, measuring around 51 by 35 millimetres (2.0 by 1.4 in). The egg is incubated for 52 to 58 days by both sexes.
Conservation
- Population trend
- declining
Photos
Distribution
Other Birds
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Euplectes orix
A small, dumpy sparrow-like weaver. The breeding male is a mix of velvety vermilion and black; the narrow black forecrown is diagnostic. The female and non-breeding male are nondescript, with a short tail and strong buff eyebrow, and are difficult to tell apart from other bishops. Pairs and small flocks are always close to water when breeding, and mixed-species colonies occur in reedbeds and swampy grassland, but they disperse into adjacent scrub in the non-breeding season, often in flocks. The song is an extended fizzling sizzle. Breeding males of other red bishop species either have no black forehead, or have a much more extensive black crown.
Black-capped Tinamou
Crypturellus atrocapillus
Subtly colorful tinamou of dense habitats in the lowlands and Andean foothills. Almost exclusively found in bamboo thickets, but also occasionally found in dense riverside vegetation and secondary growth, including around agriculture. Rarely seen, but frequently heard throughout the day; it usually gives about one call note per minute, a springy “bwow”. The most helpful visual field mark is its bright orange legs; it also has a black or dark gray cap, and brown plumage with cold gray head and neck, and reddish orange throat.
Black-headed Antbird
Percnostola rufifrons
Medium-sized, stocky bird of forest understory. Shows substantial geographic variation in plumage, but males are always black and dark gray, females rufous and gray-brown. Both sexes show thin wingbars: white in males, rufous-buff in females. Eastern populations (Guianas and NE Brazil) have striking red eyes; those of more western subspecies are gray. Found in tall rainforest and in lower-stature forests on sandy soils, usually in pairs or small groups that often follow army ants but are just as likely to be seen away from them, searching deliberately for insects in low vegetation. Not especially shy but often assesses observers warily from dense cover, pumping tail and giving low churring calls similar to other antbirds. Song is a series of clear, whistled notes on one pitch, with some geographic variation in pace; most common call is a sharp bark, similar to call of Black-faced Antthrush. In dim forest light, male may be confused with Spot-winged Antbird; Black-headed is best distinguished by wing bars (not spots), stockier profile, and vocalizations.
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