Tim Birkhead, Jens-Kjeld Jensen, Jamie Thompson, Sjurdur Hammer, Paul Thompson and Robert Montgomerie / March 2020 – vol. 113, issue 3, pp 165–170 Tim Birkhead, Jens-Kjeld Jensen, Jamie Thompson, Sjurdur Hammer, Paul Thompson and Robert MontgomerieAbstract Members of the seabird family Procellariidae (albatrosses, petrels and shearwaters) typically produce a single-egg clutch. Two-egg clutches have been recorded occasionally in some of those species, but it is not known whether they were laid by a single female. In this study we examine... This article is only available to registered users.To read more, please log in or purchase a subscription.