What is the meaning of "herd"?

[Fita Ganora]

English Grammar Tests, Elementary Level

ESL/EFL Test #89 "Common Quantity Nouns", question 9

The herd of ......... kept eating as the wind blew past them.

(a) people
(b) birds
(c) cows
(d) crows

English Grammar Tests, Elementary Level

ESL/EFL Test #89 "Common Quantity Nouns", answer 9

The herd of cows kept eating as the wind blew past them.

Correct answer: (c) cows
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What is the meaning of "herd"?

Fita Ganora

[Mister Micawber]

.
Do you have a DICTIONARY, Fita?
.
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Native English teacher at Mister Micawber's

[Ferdinant]

Mister Micawber writed: Collective nouns for animals are notoriously arbitrary, Gabi. We have flocks of sheep, herds of cattle, gaggles of geese, and tintinnabulations of starlings.
Why then "The herd of cows" is correct ?
Ssory, I understood.

[Mister Micawber]

Because among the answer choices, only 'cows' are in herds.
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Native English teacher at Mister Micawber's