My 2month old kitten appears to have a wax build up in her ears. Every time she shakes her head I can actually hear the wax move around and if I rub around her ears I can hear it move around.. I attempted to clean her outer ears a little bit, with lots of uncooperation, and after she shook her head, black coffee ground like wax came out. I've been looking on many sites wondering if the wax buildup would be caused from ear mites.
