Maybe the prey is too small?? If your babies are as small as the one I just got then they should be taking something slightly bigger than a mouse fuzzy. Look at my "Kings first feeding" thread, and a but further down there's another one I posted when I first brought him home from NARBC. He's pretty small but he ate a barely weaned mouse and had it swallowed before I even had a chance to take more pics.
The week previous to this I had offered a large fuzzy and he showed no interest.
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*Factoid: "There are no such things as Hogg Island or Columbian boas"