He was referring to all the spies for the opposing forces. The birds and other creatures were able to pass messages.
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Bilbo's personality and outlook on life have been completely changed
what does mantelpiece mean in the hobbit
There is no character called "blbo" in the Hobbit and we do not know what you mean by "frequentoy".
To make light of, to play around with, to not take seriously.
A gross is the standard term for a dozen dozens, which is 144.