Data from: Polyspermy in birds: sperm numbers and embryo survival

Nicola Hemmings & Tim R. Birkhead
Polyspermy is a major puzzle in reproductive biology. In some taxa, multiple sperm enter the ovum as part of the normal fertilisation process, while in others, penetration of the ovum by more than one sperm is lethal. In birds, several sperm typically enter the germinal disc, yet only one fuses with the female pronucleus. It is unclear whether supernumerary sperm play an essential role in the avian fertilisation process and, if they do, how females...
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