I have 3 months old chinchilla, she is rescue so grew up with foster chinchilla mom and friends with human since she was less than a week of age. I brought her home when she was month and half old. So I think she was pretty tamed already. From day 1, she would jump on my palm and shoulder, use my leg as a ladder or a bridge. She would take treats and hay from me and eats them inside and outside of cage. And she play bites all the time, more likely play nibbling like a puppy. But whenever I try to hold her when she jumps on my palm she bites the crap out of me and I bleed. So far it happened like 4 times. I never grabs her or chases her to catch. Is that just her characteristic? She lets me pet her head, back or stomach even let me touch her hands and feet oh and she loves when I scratch her neck. I guess she does not like to be held? or is that something time, patient, love and some blood(lol) would help. Does that mean my chin is not tamed? By the way, she loves my dachshund. She would let her do anything to her including sniffing and kisses. They are under supervision 24/7 whenver they are together but my dog is super lazy and mellow.