I have a Xantholophus that just gave birth 10 days ago. She never really got the "bag of marbles" look but she did get fat. Her eating did slow down especially the last week before she had the babies. She also would gasp sometimes with her mouth open and she was quite often very dark as she was cranky. Once she had the babies she is much happier now and her normal green color mostly. 2 Months before she had the babies I figured she was pregnant because of how fat she got. She had 10 babies that are now 10 days old.