Why should we choose Fish here?

[Enlearnercn]

English Grammar Tests, Elementary Level

ESL/EFL Test #89 "Common Quantity Nouns", question 10

At the show, we saw many different schools of ..........

(a) birds
(b) cattle
(c) fish
(d) beads

English Grammar Tests, Elementary Level

ESL/EFL Test #89 "Common Quantity Nouns", answer 10

At the show, we saw many different schools of fish.

Correct answer: (c) fish

Your answer was: incorrect
At the show, we saw many different schools of birds.
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Dear Sir,

Why should we choose Fish here?

Thanks in advance

Enlearnercn

[Alan]

Hi Enlearnercn,

The accepted word for a collection of fish swimming in the sea/river is a school of fish.

Alan
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English as a Second Language
You can read my ESL story Womens' Day