User blog comment:D2r/Unanswered Questions of Redwall/@comment-1669318-20110425203014

2a. I believe Ferdy and Coggs used a forge in the cellar to make the weathervane in Ledgend of Luke. This implies that the forge in the cellar has always been there.

14. Since all but five of Warbeak's command died fighting Stonefleck (and one was later killed by Ironbeak's rooks), and all those who remained behind were killed by Ironbeak, only four sparrows were left. They may have had a few chicks in the few seasons before the epilogue to Mattimeo, which gives the impression they were flourishing, but four individuals can't sustain a population long-term...

20. Reptiles have the ability to go into a hibernation-like state where their body temperature and metabolism remains very low. This enables them to survive very long without food (many reptiles can go for half a year) and at very low temperatures. He would only occasionally come out to eat, leading to the impression that he is a stone that walks rather than an animal with a rock-hard shell. Also, Gulo's family and thier soldiers would likely require some heat source as well. They obviously have access to wood since they have ships, so fire is definetly available.