Therin has proposed that Aussies, at least, treat "herd" as singular, which is what has me wondering.
Interesting that your dictionary link uses only
people-related terms for examples:
In British English, such nouns are commonly treated as plurals: The corporation are holding their annual meeting. The team are playing well. The government are in agreement.
I'm not so sure I'd
ever say "the team are...", though. If that's supposed to be strictly correct for UK English then it's standing in for "The team [members] are...", and if in doubt I'd write it that way.
I don't think this applies to "Corporation" - I don't think it's not a plural noun, it's singular, just as "company" is singular.