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    • Why do birds lay eggs that fail to hatch? 

      Johnsen, Helene Dale (The University of Bergen, 2019-06-22)
      In birds, an average of 10-15% of eggs reportedly fail to hatch and remain in the nest after completed incubation. This is due to either fertilization failure or embryo death. Hatchability (the proportion of eggs hatching) ...
      Master thesis