Jays are a

paraphyletic Paraphyly is a taxonomic term describing a grouping that consists of the grouping's last common ancestor and some but not all of its descendant lineages. The grouping is said to be paraphyletic ''with respect to'' the excluded subgroups. In co ...

grouping of

passerine A passerine () is any bird of the order Passeriformes (; from Latin 'sparrow' and '-shaped') which includes more than half of all bird species. Sometimes known as perching birds, passerines generally have an anisodactyl arrangement of their ...

birds Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a fou ...

within the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Corvidae Corvidae is a Cosmopolitan distribution, cosmopolitan Family (biology), family of Songbird, oscine passerine birds that contains the crows, ravens, Rook (bird), rooks, magpies, jackdaws, jays, treepies, choughs, and Nutcracker (bird), nutcrackers ...

. Although the term "jay" carries no taxonomic weight, most or all of the birds referred to as jays share a few similarities: they are small to medium-sized, usually have colorful feathers and are quite noisy. These superificial characteristics set them apart from most other corvids such as

crow A crow is a bird of the genus ''Corvus'', or more broadly, a synonym for all of ''Corvus''. The word "crow" is used as part of the common name of many species. The related term "raven" is not linked scientifically to any certain trait but is rathe ...

raven A raven is any of several large-bodied passerine bird species in the genus '' Corvus''. These species do not form a single taxonomic group within the genus. There is no consistent distinction between crows and ravens; the two names are assigne ...

jackdaw Jackdaws are two species of bird in the genus ''Coloeus'' closely related to, but generally smaller than, crows and ravens ('' Corvus''). They have a blackish crown, wings, and tail, with the rest of their plumage paler.Madge & Burn (1994) 136� ...

s, rooks and

magpie Magpies are birds of various species of the family Corvidae. Like other members of their family, they are widely considered to be intelligent creatures. The Eurasian magpie, for instance, is thought to rank among the world's most intelligent c ...

s, which are larger and have darker plumage. Many so-called "jays" are genetically closer to these other corvids than other jays, however.

Systematics and species

Jays are not a

monophyletic In biological cladistics for the classification of organisms, monophyly is the condition of a taxonomic grouping being a clade – that is, a grouping of organisms which meets these criteria: # the grouping contains its own most recent co ...

group. Anatomical and molecular evidence indicates they can be divided into a

New World The term "New World" is used to describe the majority of lands of Earth's Western Hemisphere, particularly the Americas, and sometimes Oceania."America." ''The Oxford Companion to the English Language'' (). McArthur, Tom, ed., 1992. New York: ...

and an

Old World The "Old World" () is a term for Afro-Eurasia coined by Europeans after 1493, when they became aware of the existence of the Americas. It is used to contrast the continents of Africa, Europe, and Asia in the Eastern Hemisphere, previously ...

lineage (the latter including the

ground jay The ground jays or ground choughs belong to a distinct group of the passerine order of birds in the genus ''Podoces'' of the crow family Corvidae. They inhabit high altitude semi-desert areas from central Asia to Mongolia. Ground jays show adapt ...

s and the

piapiac The piapiac (''Ptilostomus afer'') is an African bird in the crow family, and is the only member of the genus ''Ptilostomus''. It is most closely related to the Central Asian ground jays. Taxonomy In 1760 the French zoologist Mathurin Jacques Br ...

), while the grey jays of the genus ''Perisoreus'' form a group of their own.http://www.nrm.se/download/18.4e32c81078a8d9249800021299/Corvidae%5B1%5D.pdf PDF fulltext The

black magpie ''Platysmurus'' is a genus of treepie in the family Corvidae Corvidae is a Cosmopolitan distribution, cosmopolitan Family (biology), family of Songbird, oscine passerine birds that contains the crows, ravens, Rook (bird), rooks, magpies, jackd ...

s, formerly believed to be related to jays, are classified as

treepie The treepies (known also as crypsirinines from the subfamily's name, Crypsirininae) comprise four closely related genera (''Dendrocitta'', ''Crypsirina'', ''Temnurus'' and ''Platysmurus'') of long-tailed passerine birds in the family Corvidae. Th ...

Old World ("brown") jays

Grey jays

New World jays

In culture

Slang

The word ''jay'' has an archaic meaning in American slang meaning a person who chatters impertinently. The term ''

jaywalking Jaywalking is the act of pedestrians walking in or crossing a roadway if that act contravenes traffic regulations. The term ''jay-walker'' originated in the United States as a derivation of the phrase ''jay-driver'' (the word ''jay'' meaning a ...

'' was coined in the first decade of the 1900s to label persons crossing a busy street carelessly and becoming a traffic hazard. The term began to imply recklessness or impertinent behavior as the convention became established. In January 2014, Canadian author Robert Joseph Greene embarked on a lobbying campaign among ornithologists in Europe and North America to get Merriam-Websters Dictionary to have a "Jabber of Jays" as an official term under bird groups.

References

External links

* * {{Corvidae Corvidae Bird common names