Today I was thinking about how BP's know if they have mites or not. Since often they will soak and lose their appetite at the first few noticeable mites. I relate this to a human having a tick, I have no idea it is on me until I either feel it, or feel it moving. Even then they are hard to detect. So I wonder how BP's can detect them, through feeling? Either way, it is an amazing feat of instinct!