Meaning of "a flight of stairs"

[June]

English Grammar Tests, Elementary Level

ESL/EFL Test #89 "Common Quantity Nouns", question 4

As she looked up, she saw a flight of ..........

(a) birds
(b) insects
(c) crows
(d) stairs

English Grammar Tests, Elementary Level

ESL/EFL Test #89 "Common Quantity Nouns", answer 4

As she looked up, she saw a flight of stairs.

Correct answer: (d) stairs

Your answer was: incorrect
As she looked up, she saw a flight of birds.
_________________________

Pls kindly explain why is "a flight of stairs".

Thanks so much for your time.

June

[Mister Micawber]

.
A portion of a full stairway between floors or between landings-- that is, a straight series of steps without a break-- is called a flight.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber

[Tom]

Sorry, it is given below!

Tom

[Tom]

Can't we also see FLIGHT OF BIRDS?

FLIGHT OF BIRDS

http://www.astronomy-images.com/day-images/California/Birds/flight_of_birds.htm

Tom

[Yankee]

Hi Tom

Your first link doesn't work. Here are the first two sentences from your second link:

The flight of birds has been the object of man's study since prehistoric times, and the subject of emulation, admiration, and envy. Here I present some images of the flight of some of the birds in my neighborhood in Northern California and a few elsewhere.

Now here's my question for you:

Your link refers to "the flight of birds". How is that different from "a flight of birds"?

Amy