I have read up on how mantids are not likely to bite, if handled properly. I have Chinese Mantis that seems to want to "nibble" on my hand. It is not like a sudden strike, more like he just lays his head on my hand and starts gnawing on the skin. It didn't hurt but did freak me out! I thought it might be a one-off anomalous behavior but I just had him out of his enclosure again just now and he seemed to be wanting to get another taste. Is this normal?