T
Tim R. Birkhead
Researcher at University of Sheffield
Publications - 253
Citations - 22798
Tim R. Birkhead is an academic researcher from University of Sheffield. The author has contributed to research in topics: Sperm & Sperm competition. The author has an hindex of 76, co-authored 245 publications receiving 21710 citations. Previous affiliations of Tim R. Birkhead include Pierre-and-Marie-Curie University & Uppsala University.
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Why do male birds stop copulating while their partners are still fertile
TL;DR: The hypothesis that copulations were less efficient once egg laying has started was supported, as was the sperm competition hypothesis across different mating systems, and the hypothesis that continued copulation may benefit both sexes.
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Selection and utilization of spermatozoa in the reproductive tract of the female zebra finch Taeniopygia guttata.
TL;DR: The numbers and proportion of spermatozoa reaching different parts of the female reproductive tract after a single natural insemination were investigated in zebra finches Taeniopygia guttata.
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Diversity in olfactory bulb size in birds reflects allometry, ecology, and phylogeny
Jeremy R. Corfield,Jeremy R. Corfield,Kasandra Price,Andrew N. Iwaniuk,Cristián Gutiérrez-Ibáñez,Tim R. Birkhead,Douglas R. Wylie +6 more
TL;DR: In this paper, the relative size of olfactory bulbs is used as a neuroanatomical proxy for olfaction capabilities in 135 species of birds, representing 21 orders.
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Extra-pair courtship, copulation and mate guarding in wild zebra finches taeniopygia guttata
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Sperm precedence in the domestic fowl
TL;DR: No marked last-male sperm precedence was observed and the results did not differ significantly from that predicted by the passive sperm loss model, in which a last- male effect is determined by the rate at which sperm are lost from the female tract and the interval between successive inseminations.