Started doing some to-scale size references for Redwall-verse species, including some speculative ones (and corrected identifications, such as Jacques's few infamous instances of "crested lizards"... those are newts, buddy).
All the creatures in this series are obviously much less tiny or gigantic in proportion to each other than their real-life inspirations. Kinda got to do that to make a building useful for both small mice and massive badgers and otters!
All of the smaller bat species that would be present in the Mossflower and surrounding regions, though the series itself doesn't pay much attention to bats and their great diversity and very different life cycles. For the most part, any bats seen in the series are the mouse-eared bat or the pipistrelle (two of the most common, generic "lives in big caves" small insectivorous species) All of the bats in the series itself that appear are regarded as belonging to the "goodbeast" class, a pleasant change from the usual end result of Being an Animal the Public Loves to Hate featuring in Redwall (like poor rats, weasels, and snakes...). The bats that do show do seem to embrace their elevated status somewhat, though appear a bit more oblivious to the deep, nasty depths that the roots of such division go to, and their wide-reaching and often violent consequences. I suppose if you lived in a cave and never met any outsiders but one time in a generation, you'd be oblivious too. Of course... Jacques made Biology-Class-Failing blunders the first few times he tried including bats, the worst of which was presenting the bats as blind. OOPS. That's an animal-myth so widely-criticized you'd have to find a very sheltered kid or a very dim-witted adult to see people still spreading that little nugget of unwisdom.
The next time part of my series here shows bat species on it, it will include the larger ones. Which I speculate would NOT get the more friendly "goodbeast" class regard, largely down to their greater size meaning their natural predation would not be focused entirely on invertebrates (especially as the largest European bats do hunt small vertebrates, as bats are obligate carnivores). Being willing to hunt small birds, frogs, and mammals would stamp 'em with that Scarlet V of "vermin". The only reason some hunting creatures appear to still get counted "goodbeast" is that they have followed a sort of arbitrary rule: Only hunting fellow animals which "goodbeasts" haven't assigned any sort of intelligent-creature status to, which would be basically all invertebrates and fish... which becomes deeply iffy if you realize that a number of social insects, mollusks, and fish in general are very much just as conscious and intelligent as various mammals and reptiles in real life, so presumably they're sentient in the Redwall universe but just aren't capable of verbal speech. Except the ones that are. OOPS. Yeeeeeaaaaah... having river eels as named, speaking characters on occasion really hammers home that "goodbeasts" consider fish fair game only by some rigid rules division--their horror at seeing birds and mammals killed for food doesn't really seem morally motivated at all: They just want to be able to punish creatures for hunting anything close to them because they don't believe anything should hunt "goodbeasts" at all... but don't you tell them to make it equivocal! Of course Goodbeast creatures still get to enjoy delicious flesh--so long as it's from a creature different enough that they don't see themselves in it, and thus don't give silent permission for any of the underclass's creatures to "hunt outside the lines" they laid down on everybody.
XD It turns out, trying to stretch one's own personal pescetarianism into a universe that does not abide the same human-dominating ideologies... uh, turns out awkwardly! Especially weird when it's moral pescetarian stuff, which is a bullhonkey reason to not want to eat a bird but be perfectly a-okay with eating a parrotfish, especially with more modern animal sentience discoveries. It's a bonkers hypocrisy.
Less bonkers though than having pure-carnivore vesper bats eating exclusively mushrooms and salads. XD