DISCLAIMER: Before you comment, I have a true passion and love for tarantulas, these are one of my many pets. To the ones who feel disgusted by them, this is NOT a video for you. You need to realize that owning tarantulas is not only for pets but is also seen a hobby where people breed and sell them. there is even a forum for us hobbiysts to share our experiences (http://www.arachnoboards.com). They died because the mother packed the sac too tightly and too dry conditions. It had nothing to do with me waiting too late. I bred 2 tarantulas successful where one I left it hatch with the mother. Even though my first eggsac was a fail, I have a learned a lot about this experience, and I'll be better prepared for when I get my next eggsac. The tank may have been too dry, but now I know what to do.