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A donkey, some wolves, perhaps, and endless impala but no pa! (4,6)

Ross

I believe the answer is:

pack animal

I'm a little stuck... Click here to teach me more about this clue!

'a donkey' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for pack animal that I've seen before include "it humps loads" , "Mule, for example" , "llama, perhaps" .)

I've seen this clue in the Sydney Morning Herald.
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