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dead in the shell

  1. What causes babies not to hatch

    Cockatiel Breeding
    I had 2 hens sitting on 4 eggs each. 2 babies hatched the rest were dead in the shell. Each hen had 1 baby to hatch. 2 of the babies weren't fully developed the rest were developed but didn't hatch. Any Ideas. On hen it was her 1st clutch the other it was her 4 th clutch.
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