<P> The common name jackdaw first appeared in the 16th century, and is thought to be a compound of the forename Jack, used in animal names to signify a small form (e.g. jack snipe), and the archaic native English word daw . Formerly, western jackdaws were simply called "daws". The metallic chyak call may be the origin of the jack part of the common name, but this is not supported by the Oxford English Dictionary . Daw, first used for the bird in the 15th century, is held by the Oxford English Dictionary to be derived from the postulated Old English dawe, citing the cognates in Old High German tāha, Middle High German tāhe or tāchele, and modern German Dahle or Dohle, and dialectal Tach, Dähi, Däche and Dacha . </P> <P> Names in English dialects are numerous . Scottish and north English dialects have included ka or kae since the 14th century . The Midlands form of this word was co or coo . Caddow is potentially a compound of ka and dow, a variant of daw . Other dialectal or obsolete names include caddesse, cawdaw, caddy, chauk, college - bird, jackerdaw, jacko, ka - wattie, chimney - sweep bird (from their nesting propensities), and sea - crow (from the frequency with which they are found on coasts). It was also frequently known quasi-nominally as Jack . </P> <P> An archaic collective noun for a group of jackdaws is a "clattering". Another name for a flock is a "train". </P> <P> A study in 2000 found that the genetic distance between jackdaws and the other members of Corvus was greater than that within the rest of the genus . This led Pamela Rasmussen to reinstate the genus name Coloeus, created by Johann Kaup in 1829, in her Birds of South Asia (2005), a treatment also used in a 1982 systematic list in German by Hans Edmund Wolters . A study of corvid phylogeny undertaken in 2007 compared DNA sequences in the mitochondrial control region of several corvids . It found that the western jackdaw, and the closely related Daurian jackdaw (C. dauuricus) of eastern Russia and China, were basal to the core Corvus clade . The names Coloeus monedula and Coloeus dauuricus have since been adopted by the International Ornithological Congress in their official list . The two species of jackdaw have been reported to hybridise in the Altai Mountains, southern Siberia, and Mongolia . Analysis of the mitochondrial DNA of specimens of the two species from their core ranges show them to be genetically distinct . </P>

What is the name for a group of jackdaws