Childlessness by circumstance

ScienceDaily
Oct 20, 2020, 11:13 am165 pts
In birds and other species alike, pairs can face considerable difficulties with reproduction. Scientists have now shown in an extensive analysis of 23,000 zebra finch eggs that infertility is mainly due to males, while high embryo mortality is more a problem of the females. Inbreeding, age of the parents and…

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