Hello there! New millipede owner here. I just acquired to desert millipedes who are doing well, but i have a question. I haven't really been handling them at all because I understand they are the best critters to be touchy feely with, but when i do pick them up, they bite me! They are rather large, about 5 inches, and sometimes they bite pretty hard. Is this normal behavior? Or something im doing wrong? I've only had them a few days. Thanks!