Twitchers' vocabulary is the set of jargon words used by twitchers. Twitchers are committed bird-watchers who travel long distances to see a new species just to add a species their "lifelist", "year list" or other lists. Some terms may be specific to regional birding communities, and not all are used due to dialectic and cultural differences.
- To burn up or flog: To beat around in the undergrowth hoping to flush a bird. A desperate measure and not a kind way to treat an exhausted migrant.
- Mega or Megatick: A very rare bird
- Chooks: already seen or common birds (used in Australia).
- Crippler: A rare and spectacular bird that shows brilliantly, perhaps an allusion towards its preventing people from moving on.
- To dip out (or dip): To miss seeing a bird which you were looking for.
- Dude: "A posh bird-watcher who doesn't really know all that much about birds." A novice birdwatcher; slightly pejorative term. Also used to refer to someone who primarily seeks out birds for photography rather than study.
- First: A first record of a species (in a defined area, such as a county first).
- To grip off (or grip): To see a bird which another birder missed and to tell them you've seen it.
- Jizz: the overall impression given by the general shape, movement, behaviour, etc., of a species rather than any particular feature. Experienced birders can often identify species, even with only fleeting or distant views, on jizz alone.
- Lifer: A first-ever sighting of a bird species by an observer; an addition to one's life list.
- Noun: a list of all species seen by a particular observer (often qualified, e.g. life list, county list, year list, etc.). Keen twitchers may keep several lists, and some listers compete to amass longer lists than their rivals.
- Verb: to keep or compile a bird list (lister is close in meaning to twitcher).
- Plastic: Adjective used to indicate a bird which has escaped from captivity, rather than a genuinely wild bird.
- Sibe: A bird from Siberia (usually applied to rare migrants).
- Tick: An addition to a personal list (sometimes qualified as year tick, county tick, etc.). Life tick and lifer are synonymous. A tart's tick is a relatively common species added to one's list later than might be expected.
- Yank: A bird from North America (usually applied to rare migrants).
Some species have nicknames, for example: "RB Flicker" for Red-breasted Flycatcher, "Gropper" for Grasshopper Warbler, "PG Tips" for Pallas's Grasshopper Warbler. Twitchers (and birders in general) will also use a mixture of scientific and slang terms for feather tracts and so on.