The white-tufted grebe (''Rollandia rolland''), also known as Rolland's grebe, is a species of

grebe Grebes () are aquatic diving birds in the order Podicipediformes . Grebes are widely distributed freshwater birds, with some species also found in marine habitats during migration and winter. Some flightless species exist as well, most notably ...

in the family Podicipedidae. Found in the southern half of

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sout ...

, its natural

habitat In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical ...

is freshwater

lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...

s, ponds and sluggish streams.

Taxonomy and etymology

Three subspecies are recognised: *''R. r. chilensis'' (

Lesson A lesson or class is a structured period of time where learning is intended to occur. It involves one or more students (also called pupils or learners in some circumstances) being taught by a teacher or instructor. A lesson may be either one ...

, 1828) – South

Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = National seal , national_motto = "Firm and Happy f ...

and southeast

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

southwards to

Cape Horn Cape Horn ( es, Cabo de Hornos, ) is the southernmost headland of the Tierra del Fuego archipelago of southern Chile, and is located on the small Hornos Island. Although not the most southerly point of South America (which are the Diego Ramí ...

and

Tierra del Fuego Tierra del Fuego (, ; Spanish for "Land of the Fire", rarely also Fireland in English) is an archipelago off the southernmost tip of the South American mainland, across the Strait of Magellan. The archipelago consists of the main island, Isla ...

. *''R. r. morrisoni'' (Simmons, 1962) – Central

Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = National seal , national_motto = "Firm and Happy f ...

. *''R. r. rolland'' ( Quoy &

Gaimard Joseph Paul Gaimard (31 January 1793 – 10 December 1858) was a French naval surgeon and naturalist. Biography Gaimard was born at Saint-Zacharie on January 31, 1793. He studied medicine at the naval medical school in Toulon, subsequent ...

, 1824) –

Falkland Islands The Falkland Islands (; es, Islas Malvinas, link=no ) is an archipelago in the South Atlantic Ocean on the Patagonian Shelf. The principal islands are about east of South America's southern Patagonian coast and about from Cape Dubouze ...

. The white-tufted grebe is also called Rolland's grebe.

Description

The male and female white-tufted grebe look alike and are between in length. Adults in breeding plumage have a prominent black crest on the back of their heads. There is a large white tuft of feathers around the ear but otherwise the head, neck and back are black, with a slight greenish sheen, and the feathers of the mantle and back are narrowly bordered with brown. The underparts are a dull reddish-brown, often mottled with brown or grey. The secondary wing feathers are white, pale grey or have white tips. The eye is red, the beak black and the legs grey or olive-brown. Adults in non-breeding plumage are dark brown rather than black. The crest becomes inconspicuous, the sides of the head and throat are white and the white wing patches are retained. The neck and chest are buff, gradually paling to white on the belly. Immature birds resemble adults in non-breeding plumage but their throats and the sides of their necks have brown streaking.

Distribution and habitat

The white-tufted grebe is found in the southern part of South America. Its range includes south-eastern Brazil, Uruguay, Paraguay, Bolivia, Chile, Peru, Argentina and the Falkland Islands. It occurs as a vagrant in the South Sandwich Islands and South Georgia. Its typical habitat is lakes, marshy ponds, ditches and slow-moving streams. Birds in the southern part of the range form into flocks after the breeding season and migrate northwards up the coast. These are often seen in bays and other sheltered marine locations.

Behaviour

Breeding

The white-tufted grebe nests in colonies in beds of reeds, with individuals preferring small areas that have a high density of reeds surrounded by water and colonies, as a whole, being located in areas adjacent to water with a low density of reeds overall with small clumps that have a high density of reeds. This grebe usually lays a clutch of one to three eggs. These eggs usually measure about .

Status

The white-tufted grebe has an extensive range. The IUCN lists the species as being of "

least concern A least-concern species is a species that has been categorized by the International Union for Conservation of Nature (IUCN) as evaluated as not being a focus of species conservation because the specific species is still plentiful in the wild. T ...

" as, although the population trend may be downwards, the total population is large and this means the bird does not meet the criteria for listing it in a more threatened category.

References

{{DEFAULTSORT:White-tufted grebe Rollandia (bird) Birds described in 1824 Taxonomy articles created by Polbot