I am starting to think that I was lied to when purchasing the White lipped tree viper pair and the female is in fact not pregnant. She seems to be getting thinner not fatter and today I decided to put the male back in with her and he was all over her, trying to mate and she seemed to be receptive. Haven't seen then coupling yet, but will keep my eyes open. Hopefully she will now get pregnant. Will keep you updated on her progress.