Browsing Bergen Open Research Archive by Author "Johnsen, Helene Dale"
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Why do birds lay eggs that fail to hatch?
Johnsen, Helene Dale (Master thesis, 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) ...