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You can see one of the tiny holes as a black dot. |
As far as I can see after a Google search, they are probably the egg sacs of the Bird-dropping Spider -- so called, not because it drops birds, but because it is a squashy, messy-looking fellow that resembles a bird dropping. We didn't see the lady guarding her eggs, so maybe her disguise was really good...
Bird-dropping Spider (Celaenia excavata)