Hey folks. The weekly question from Gan returns.
In a dark fantasy I'm doing, I want the castle to have creatures (rodents, insects, pests in general) you would typically find (But, of course, altered in very odd, sometimes grotesque ways). I'm assuming things like rats and spiders wouldn't be uncommon, but I know very little about what pests might actually inhabit a castle.
So, what kind of pests might one encounter in a typical medieval castle?
Insects. Open windows and doors let in flying things, everything else crawls. Flies, cockroaches, spiders...
Pests also come in with supplies.
Disease is also rampant, though not a visible pest. Microorganisms carry disease - not just the well known stuff like smallpox, but also common colds, diarrhea, etc...
Don't forget mythical pests, like the garden gnomes in Harry Potter. You could have pygmy dragons or rebellious gargoyles causing problems.
Also pay attention to the climate where your castle is located. A medieval English castle will have rats and bugs and bats. A castle in ancient arabia will have spiders and scorpions and snakes and stuff.
I'm reading a story where there's a bunch of ghosts that follow the MC around making trouble for her (e.g., they can't lift the drawbridge for a few minutes after she arrives because all the ghosts are weighing it down.) It's kind of funny, though it's also clearly a plot element put into place to solve a problem later (eventually the ghosts help quell the peasant rebellion, lol.)
I like the idea of mythical pests. There's some good fun you could have there with the idea of something like a centipede or a bat, then twist it to make it fit your story...
I've been in several English castles (and a few Italian and German-style castles, though not as many) and I've never seen any rodents running around. Then again, most of them are no longer being used the way they would have been when they were new. I'm sure there were rats and mice everywhere (where there is food left in the open, there will be rats), especially since under the rushes, there were bones and other bits of food. Rushes were changed regularly, but it's suspected that many castles simply lay new rushes and herbs over old trash.
Also keep in mind that there would always be dogs around, which would keep most of the rodent population in check. Not bugs, necessarrily, but rats and mice would try to stay away from even the smell of dogs. It's just a thought.
Castles in use are a very different prospect from castles today, which are either uninhabited but preserved ruins (with no real food supply) or still lived in but with modern doors, windows, and pesticides available...
If we are assuming your "medieval" castle means a broadly European fauna, then you will have huge numbers of invertebrates, and large numbers of small rodents. Dogs and cats may well keep the rodent population under some kind of control but they will very definitely be present in significant numbers. Birds are unlikely to make much use of inhabited/heavily used buildings but will next in unoccupied areas; likewise bats. Swallows and martins will likely nest on the outside of the castle if it is in a farmed area (pre-pesticide farms = insects; insects = swallows); likewise sparrows will be somewhere around but probably not in big enough numbers to be considered a pest (grain pests are mice and rats, which was why granaries were often raised on mushroom stones to stop them from climbing in).
Four-poster/canopy beds were originally designed to prevent bugs and droppings and the like falling on the beds from the roof (which would not have been plastered), which says something about how prevalent pests were.
If your castle is in less traditional fantasy climes, you are at liberty to have scorpions, giant centipedes, snakes, lizards, cockroaches, praying mantises, termites and more as potential problems.