[citation needed] Birkhead's research also resolved the issue of polyspermy in birds and provided the first evidence for morphological sperm selection in the female reproductive tract.
[8] His long term study of the population biology of common guillemots on the island of Skomer off Wales has run since 1972, and is currently in need of support.
The pyriform shape makes the egg inherently more stable, especially on the sloping surfaces on which guillemots commonly breed.
Delegates are from a diverse range of backgrounds and include clinicians, reproductive physiologists, andrologists, theoreticians and evolutionary biologists.
[citation needed] He has featured on numerous BBC Radio 4 programmes, including Start the Week — with Jeremy Paxman;[when?]
[27] Over the course of his career, Birkhead has received a number of awards: "All text published under the heading 'Biography' on Fellow profile pages is available under Creative Commons Attribution 4.0 International License."