User blog comment:D2r/Unanswered Questions of Redwall/@comment-1399757-20100716204621

Cluny's grandfather's rats take 10 years to chop down massive trees, take another 20 years to plane them, his father's rats another 15-20 to put them together. Maybe it was some generational project that the Clunys had going :P. But that still leaves us with the whole "where did the horse come from?" debate.