Twitchers' vocabulary

Big Day

a birding event in which a birder or team of birders tries to see as many species of birds as possible within a calendar day.[3]

Big Year

a birding event in which a birder tries to see as many species of birds as possible within a defined area (county, state, ABA area, etc.) within a calendar year; originated with the American Birding Association, and the basis for the movie The Big Year.[3]

To burn out

To bird to the point of no longer wanting to continue birding/twitching.

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.[4]

BVD

"Better View Desired", describing a lifer that was observed well enough to identify, but not enjoy.[3]

CBC

Christmas Bird Count, an annual bird census in North America and Canada.

CFW (Eastern North America)

An abbreviation that stands for “Confusing Fall Warbler” (During fall migration and through mid spring, most members of Parulidae found in the Eastern US and Canada tend to be in nonbreeding plumage, and therefore have relatively few distinctive markings or patterns).

Chooks (Australia)

already seen or common birds.[1]

CMF

a Cosmic Mind F*** (or F***er), an exceptionally good bird, at least at the level or even greater than a Crippler.[5]

Crippler (UK)

a rare and spectacular bird that shows brilliantly, perhaps an allusion towards its preventing people from moving on.

Crush (verb, U.S.)

to get very high-quality photos of a bird, often referred to as a banger. See hammer

Dip (or dip out)

to miss seeing a bird which you were looking for.

Dude

"a bird-watcher who doesn't really know all that much about birds."[4] A novice birdwatcher; slightly pejorative term. Also used to refer to someone who primarily seeks out birds for photography rather than study.[1]

Empid (US)

any of the flycatchers of the genus Empidonax, infamous among North American birders for being difficult to identify in the field without the aid of vocalizations.

Fallout

a natural occurrence where migratory birds are forced down by adverse weather in a way that makes them congregate in large numbers; generally associated with meteorological and geographical conditions (exclusively in spring, generally in the United States along the Texas and Florida coasts of the Gulf of Mexico).[3]

First

a first record of a species (in a defined area, such as a county first).[4]

Grip (or grip off) (UK)

to see a bird which another birder missed and to tell them you've seen it.[4]

Hammer (US)

to get high-quality photos of a bird.

Jizz or giss

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.

LBJ (or little brown job. UK)

drab songbirds that are difficult to differentiate and identify.[2]

Lifer

a first-ever sighting of a bird species by an observer; an addition to one's life list.[4]

List

as a 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. As a verb, it means to keep or compile a bird list (a lister is someone who is intensely focused on keeping and growing lists, and can be used negatively).

m.ob. or mob or MOB

an abbreviation that stands for "many observers," often used as a collective noun

Mega or megatick or meguh

a very rare bird[4]

Nemesis (or nemesis bird)

a bird that has eluded a birder despite multiple attempts to see it.[3][2]

NFC

Stands for Nocturnal Flight Count: To conduct a survey of birds migrating at night by listening for their flight calls, often with a specialized microphone.

Patagonia Picnic Table Effect (or Patagonia Roadside Rest Effect) (US)

the phenomenon that occurs when one bird draws many birders to a remote area, who then find more rarities and other interesting species in that same location. Named after an actual roadside rest area just west of Patagonia, Arizona.[2]

Patch (or local patch)

a birding location or set of birding locations near one's home that a birder visits frequently.[3]

Pelagic (noun)

a boat trip designed for birders to find open-ocean (pelagic) species, such as albatrosses.

Pish (US)

an emphatic shushing or hissing noise used by North American birders to elicit mobbing behavior; made in imitation of alarm calls of chickadees and titmice.[3]

Peep (US)

a collective term for the five smallest North American Calidris sandpipers: least sandpiper, semipalmated sandpiper, Western sandpiper, white-rumped sandpiper, and Baird's sandpiper[3]

Plastic (UK)

adjective used to indicate a bird which has escaped from captivity, rather than a genuinely wild bird.

To rack (or colloquially as a noun, rackery)

To add multiple birds to your list in an unexpectedly short period of time.

Sibe (US)

a bird from Siberia (usually applied to rare migrants).[4]

Siesta time (also the doldrums) (US)

the period in mid-afternoon when birds (and therefore birders) are least active.[2]

Skywatch (noun)

a term used to describe a stationary period of observation of birds migrating overland birds, usually passerines (the word used to describe most songbirds)

Slash

a cryptic species pair (on a day list), e.g. long-billed dowitcher/short-billed dowitcher, willow flycatcher/alder flycatcher[3]

SOB

"Spouse of Birder", a non-birder spouse.[2]

Spark bird

a species that triggers a lifelong obsession with birding.[2]

Spuh

birds that are only identifiable to genus level (on a day list) (from "sp.", abbreviated form of species).

String

a dubious, "ropy" record. As an adjective a record may be stringy,[4] and to claim one is to string.[4] The term stringer usually denotes people who intentionally mislead and falsify bird sightings, as opposed to well-intentioned mistakes made from lack of field experience.[3]

Tick

an addition to a personal list (sometimes qualified as year tick, county tick, etc.). Life tick and lifer are synonymous.[4] A tart's tick is a relatively common species added to one's list later than might be expected. An armchair tick is an addition without leaving one's home, typically as a result of a taxonomic change.[6]

To pull an Easterla (California)

to find a ridiculously rare vagrant in a place with no vagrant potential whatsoever. As in: "A first state record of Yellow-browed Warbler in Alpine County? How did a Sibe end up 160 miles inland alongside a mountain stream?! And how was it even found?!?"

Trash bird

a bird that is so common to an area it becomes annoying and is largely ignored by birders (as the European Starling, Rock Pigeon, or House Sparrow). Sometimes used sarcastically, as in "You're excited about seeing a Bald Eagle? It's a trash bird for us in Alaska."

Twitch

the act of traveling a long distance to see a rare bird. Synonymous with chase.

Vagrant

a stray far from normal ecological range.[2]

Warbler Neck (US)

a painful crick in the neck from looking at birds high in the treetops. Named after the New World warblers, which are often found in the tops of trees.

Yank (UK)

a bird from North America (usually applied to vagrants seen in Europe).

Zootie (US, uncommon)

a locally rare or unusual bird.[3]

Some species have nicknames, for example: "RB Flicker" for Red-breasted Flycatcher, "Gropper" for Grasshopper Warbler, "PG Tips" for Pallas's Grasshopper Warbler; in the US, these are generally reserved for common species ("TV" for Turkey Vulture or "butterbutt" for Yellow-rumped Warbler). Every bird found in the US has a formal four-letter banding code formed with the first letters of its name (for example, Carolina Chickadee is CACH), and these abbreviated species terms often find their way into American slang. Twitchers (and birders in general) will also use a mixture of scientific and slang terms for feather tracts and so on.