I have a 4 year old female Impressa that started showing signs of aggression towards me a couple months ago, every now and then she tries to sneak in a bite to my fingers or hand by lunging forward with her mouth wide open and hissing a warning noise to stay away.I'm wondering if she may be sexually mature at just 4 years of age ? She measures 9 1/4 inches and gets the head bobbing like my mep and mee, once she got a hold of the fatty part of my right hand below the little finger and didn't turn loose until I got her from under the 6x6 she had dug under and did her pancake like blowup or something of the sort to make it hard to move her out. Any one else seen actions like these from an Impress Tortoise before ? A pic of her today.