User blog comment:BonesMcGee/Brainstorm: Potential savings in using the hurry hatch trick/@comment-5556733-20121119074921/@comment-5544049-20121121042204

Since the ghost mammoth was introduced, the chances of getting anything but a common egg have gone down considerably. Read RobinCarr's blog Virtual Dino Den: Explore How Baby Dinos are Born in the Dino Den to understand how this affects your chances HH'ing.