Answer: The pigs don't trust the Raven for he is filled with tall tales and lies. The story of Sugarcane Mountain sounds to be absurd and there is no such place as this that exists, in heaven perhaps. Plus The Raven Moses is Mr. Jones's pet and they see him as a spy. Moses can't be trusted. Mose could also be using this story as a distraction for keeping the farm animals from starting their revolution.
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My personal opinion. Not sure if it is the answer you were looking for I couldn't find a multiple choice option but I hope it helps you in the process of finding your answer. Good Luck! :)