All my rats seems to be a bit itchy. From what I've read it's very unlikely to be mites because they aren't really common where we live. (high altitude, low humidity) However those same attributes might be what's causing the itchiness. I have a little weather station thing on my desk and according to it the current humidity is only 21% with the high 23% and the low 16%, so it's very dry in the house. From what I read a "healthy" humidity is between 35-50%. Does anyone else live in the high desert like this? Are your rats itchy? If so does adding a humidifier help with their itchiness?