The sharp-tailed sandpiper (''Calidris acuminata'') (but see below) is a small

wader 245px, A flock of Dunlins and Red knots">Red_knot.html" ;"title="Dunlins and Red knot">Dunlins and Red knots Waders or shorebirds are birds of the order Charadriiformes commonly found wikt:wade#Etymology 1, wading along shorelines and mudflat ...

Taxonomy

A review of data has indicated that this bird should perhaps better be placed into the

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

''Philomachus'' – as ''P. acuminatus'' – which now contains only the

ruff Ruff may refer to: Places *Ruff, Virginia, United States, an unincorporated community *Ruff, Washington, United States, an unincorporated community Other uses *Ruff (bird) (''Calidris pugnax'' or ''Philomachus pugnax''), a bird in the wader fami ...

but if the sharp-tailed sandpiper is merged into it would need to accommodate the

broad-billed sandpiper The broad-billed sandpiper (''Calidris falcinellus'') is a small wading bird. The scientific name is from Latin. The specific name ''falcinella'' is from ''falx, falcis'', "a sickle. Some research suggests that it should rather go into the gen ...

. While the latter is a peculiar

calidrid ''Calidris'' is a genus of Arctic-breeding, strongly migratory wading birds in the family Scolopacidae. These birds form huge mixed flocks on coasts and estuaries in winter. They are the typical "sandpipers", small to medium-sized, long-winged ...

, the sharp-tailed sandpiper is much more similar to other ''Calidris''/''Erolia'' species such as the

pectoral sandpiper The pectoral sandpiper (''Calidris melanotos'') is a small, migratory wader that breeds in North America and Asia, wintering in South America and Oceania. It eats small invertebrates. Its nest, a hole scraped in the ground and with a thick linin ...

. On the one hand, its larger size and long-legged stance, and the breast pattern which gradually fades away on the belly as in the ruff instead of having a fairly sharp border as in the ''Calidris''/''Erolia''

stint A stint is one of several very small waders in the paraphyletic ''"Calidris"'' assemblage – often separated in ''Erolia'' – which in North America are known as peeps. They are scolopacid waders much similar in ecomorphology to the ...

s indicate that placement in ''Philomachus'' may be correct. Still, it is just as possible that – given the fairly common instances of hybridization in calidrines –

mitochondrial DNA Mitochondrial DNA (mtDNA or mDNA) is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, such as adenosine triphosphate (ATP). Mitochondrial D ...

data has given a false picture of this species' true affinities. The

curlew sandpiper The curlew sandpiper (''Calidris ferruginea'') is a small wader that breeds on the tundra of Arctic Siberia. It is strongly migratory, wintering mainly in Africa, but also in south and southeast Asia and in Australia and New Zealand. It is a v ...

, which is a proposed parent of the hybrid called " Cooper's sandpiper" (''"Calidris"'' × ''cooperi'') together with the sharp-tailed sandpiper, is another unusual calidrid that is hard to place systematically. The genus name is from

Ancient Greek Ancient Greek includes the forms of the Greek language used in ancient Greece and the ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Dark Ages (), the Archaic peri ...

''kalidris'' or ''skalidris'', a term used by

Aristotle Aristotle (; grc-gre, Ἀριστοτέλης ''Aristotélēs'', ; 384–322 BC) was a Greek philosopher and polymath during the Classical period in Ancient Greece. Taught by Plato, he was the founder of the Peripatetic school of phil ...

for some grey-coloured waterside birds. The specific ''acuminata'' is from

Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...

''acuminatus'', "to sharpen".

Distribution and habitat

It breeds in the boggy tundra of

northeast Asia Northeast Asia or Northeastern Asia is a geographical subregion of Asia; its northeastern landmass and islands are bounded by the Pacific Ocean. The term Northeast Asia was popularized during the 1930s by American historian and political scient ...

and is strongly migratory, wintering in south east Asia and

Australasia Australasia is a region that comprises Australia, New Zealand and some neighbouring islands in the Pacific Ocean. The term is used in a number of different contexts, including geopolitically, physiogeographically, philologically, and ecologica ...

. It occurs as a rare autumn migrant to

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

, but in western

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...

only as a very rare vagrant. There is a single documented record from

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 southe ...

Description

Measurements: * Size: 22 cm * Weight: 39-114 g * Wingspan: 36–43 cm Breeding adults are a rich brown with darker feather centres above, and white underneath apart from a buff breast. They have a light superciliary line above the eye and a chestnut crown. In winter, sharp-tailed sandpipers are grey above. The juveniles are brightly patterned above with rufous colouration and white mantle stripes. This bird looks a lot like the pectoral sandpiper, within whose Asian range it breeds. It differs from that species in its breast pattern, stronger

supercilium The supercilium is a plumage feature found on the heads of some bird species. It is a stripe which runs from the base of the bird's beak above its eye, finishing somewhere towards the rear of the bird's head.Dunn and Alderfer (2006), p. 10 Also ...

and more rufous crown. It has some similarities to the

long-toed stint The long-toed stint (''Calidris subminuta'') is a small wader. The genus name is from Ancient Greek ''kalidris'' or ''skalidris'', a term used by Aristotle for some grey-coloured waterside birds. The specific ''subminuta'' is from Latin ''sub'', ...

, but is much larger than the

Behaviour

Breeding

Little is known of the breeding habits of this species, although it nests on the ground, and the male has a display flight.

Feeding

These birds forage on grasslands and mudflats, like the pectoral sandpiper, picking up food by sight, sometimes by probing. They mainly eat

insects Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of j ...

and other

invertebrates Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chordate ...

References

External links

Oiseaux
Photos {{Taxonbar, from=Q753760

sharp-tailed sandpiper The sharp-tailed sandpiper (''Calidris acuminata'') (but see below) is a small wader. Taxonomy A review of data has indicated that this bird should perhaps better be placed into the genus ''Philomachus'' – as ''P. acuminatus'' – which now ...

Wading birds Birds of North Asia

Taxa named by Thomas Horsfield