From a fascinating dining companion, rather than a literary source. The Gothic potential is self-evident.
“There are many ways to stress a rat — but the easiest way is to inject it with stress hormones.”
Bonus data-burst from the same expert: According to all the rigorous cognitive tests neuroscientists are currently able to apply, crows are as intelligent as chimpanzees. (Yes, it seems preposterous, which is what makes it worth mentioning. No, I haven’t done any back-up online research yet.)