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Watch the video in the post. The prairie dogs appear to have a basic syntax and grammar ( [threat] [shape] [color] ), according to the researchers.

That sounds like it could be generalized to [noun] [adjective] [adjective]. Notice the lack of verbs, prepositions, or markers for subordinate clauses.

This seems much closer to a code than an actual language.

To be fair, some humans have trouble grasping recursion. I can't speculate as to how or why, since I've always failed to grasp their fail to grasp.

Do we have evidence of that? At the moment it seems like we are still very early in the process of understanding non-human language.