Testis asymmetry in birds: the influences of sexual and natural selection

Sperm Competition Selects for Sperm Quantity and Quality in the Australian Maluridae

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Sperm Length Variation as a Predictor of Extrapair Paternity in Passerine Birds

(2010) Jan T. Lifjeld et al.   PLoS One

A single functional testis and long deferent duct papillae: the peculiar male reproductive tract of the classically polyandrous, sex-role reversed Black Coucal (Centropus grillii)

(2009) Roland Frey et al.   JOURNAL OF ORNITHOLOGY

Intraspecific variation in testis asymmetry in birds: evidence for naturally occurring compensation

(2009) S. Calhim et al.   PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES

SPERM COMPETITION SELECTS BEYOND RELATIVE TESTES SIZE IN BIRDS

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A Phylogenomic Study of Birds Reveals Their Evolutionary History

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