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...yeah I didn't really make any attempt to explain the squirrels within the fic itself, since it was a prompt-fill for someone who requested them.
This is the closest thing there is to an explanation, I think.
ETA: If it helps, the squirrels are an English-speaking fandom thing. In Russian-speaking fandom, Javert is assisted by an ichthyostega instead of squirrels. So, you know, it could have been worse?