The sketch features a television presenter (Graham Chapman) interviewing paleontologist Anne Elk (John Cleese in drag). The plot of the sketch is that Miss Elk (who is very concerned about being properly credited: "A. Elk, brackets, Miss, brackets") has severe difficulty presenting her new theory about brontosauruses due to her bizarre mannerisms, which include circumlocution, repetition, and obnoxious, noisy throat-clearing. When she is finally able to state her theory, it turns out to be a very trite observation that "All brontosauruses are thin at one end, much, much thicker in the middle, and then thin again at the far end." In the original broadcast version, the sketch is taken over by other jokes from within the same episode, and spills over into the set of a previous sketch where Miss Elk concludes the episode with a second theory about Marcel Proust.
This sketch was also performed on the album Monty Python's Previous Record, under the title 'Miss Anne Elk'. On this version, before beginning her second theory, the interviewer shoots her.
At Cleese's request, the sketch was performed as part of the team's 2014 live reunion show, Monty Python Live (Mostly), with Eric Idle playing the interviewer. This version concluded with an extended coughing fit, before linking to the "Dancing Teeth" animation.
- Chapman, Graham; Cleese, John; Gilliam, Terry; Idle, Eric; Jones, Terry; Palin, Michael (1989). Wilmut, Roger (ed.). The Complete Monty Python's Flying Circus: All the Words, Volume Two. New York, New York: Pantheon Books. pp. 118–120. ISBN 0-679-72648-9.
- John Mauldin (30 July 2014). "Anne Elk's Theory On Brontosauruses". The Market Oracle. Archived from the original on 31 July 2014. Retrieved 21 September 2022.
- Riggs, Peter J. (31 October 1996). Natural Kinds, Laws of Nature and Scientific Methodology. Springer Netherlands. ISBN 9780792342250.
- Hume-Pratuch, Jeff (28 January 2010). "The Generic Reference". APA Style Blog. American Psychological Association.