As rare as hen’s teeth: aberrantly coloured eggs of the northern lapwing (Vanellus vanellus) and the interface between oology and ornithology by T. R. Birkhead

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Three early books on birds’ eggs: Marsili’s Danubius Pannonico-Mysicus (1726), Zinanni’s Delle Uova e dei Nidi degli Uccelli (1737) and Klein’s Ova avium plurimarum ad naturalem ma... by T. R. Birkhead, A. Pilastro

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Postcopulatory sexual selection is associated with reduced variation in sperm morphology. by Sara Calhim, Simone Immler, Tim R Birkhead

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Maintenance of sperm variation in a highly promiscuous wild bird. by Sara Calhim, Michael C Double, Nicolas Margraf, Tim R Birkhead, Andrew Cockburn

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By hook or by crook? Morphometry, competition and cooperation in rodent sperm. by Simone Immler, Harry D M Moore, William G Breed, Tim R Birkhead

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The anatomy of the bill tip of kiwi and associated somatosensory regions of the brain: comparisons with shorebirds. by Susan J Cunningham, Jeremy R Corfield, Andrew N Iwaniuk, Isabel Castro, Maurice R Alley, Tim R Birkhead, Stuart Parsons

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Coevolution of male and female genital morphology in waterfowl. by Patricia L R Brennan, Richard O Prum, Kevin G McCracken, Michael D Sorenson, Robert E Wilson, Tim R Birkhead

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