Rick is right on in both posts, I have had thousands and some are seeming to be weaker, but what that really means is our system of having them hatch for us is the problem, temps are not right , humidity is not right, and food source is not right. They come from places that are not comparable to ours most times, the species are used to things being so so, when I was growing up,,,, mannnnnnny mooons ago, I use to get upset that one animal on nat geo would eat another, as they always filmed these things, but my parents told me that was the way in the wild, and they were right, so as where one mantis comes from new zealand and another from africa, two different places on earth, two different varieties in atmosphere. Do u see where this is going? just because I have my heat on 72F and my humidity at 50%, means they will hatch, will it be right for where they originated from? no, so they may not do as well as if they were left where they were from. ok, hands now numb, gotto go.