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Sperm size varies enormously among species, but the reasons for this variation remain obscure. Since it has been suggested that swimming velocity increases with sperm length, earlier studies proposedExpand
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The brown‐headed cowbird (Molothrus ater) is a widespread, obligate brood parasite of North American passerine birds. In southern Manitoba, where hosts are sympatric with cowbirds, American robinsExpand
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Begging intensity of nestling birds varies with sibling relatedness
Begging for food is one of the most conspicuous behaviours performed by nestling birds. Recent models suggest that the form and intensity of begging evolved not only to communicate nutritionalExpand
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Male sperm reserves and copulation frequency in birds
SummaryMale passerine birds store sperm in a cloacal protuberance during the breeding season. We consider three hypotheses to explain interspecific variation in relative cloacal protuberance size.Expand
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Sperm size and sperm competition in birds
In a sample of 20 species of North American passerine birds we found no relation between sperm size and mating system like that previously reported in mammals (Gomendio & Roldan (Proc. R. Soc. Lond.Expand
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Inbreeding and endangered species management: is New Zealand out of step with the rest of the world?
There is growing evidence that inbreeding can negatively affect small, isolated populations. This contrasts with the perception in New Zealand, where it has been claimed that native birds are lessExpand
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Sexual selection and the intromittent organ of birds
Unlike most animals with internal fertilisation, few extant bird species have a male intromittent organ (IO). Although two previously published hypotheses have attempted to account for the rareExpand
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Nest predation and the evolution of nestling begging calls
Begging by nestling birds can be conspicuous and loud. Such displays are thought to function in signalling nestling condition and securing parental care, but they also may inadvertently attract theExpand
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Extra-pair paternity, sperm competition and the evolution of testis size in birds
Sperm competition should select for increased sperm production if the probability of fertilization by a specific male is proportional to the relative number of sperm inseminated. A review of theExpand
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Introduced Mammalian Predators Induce Behavioural Changes in Parental Care in an Endemic New Zealand Bird
The introduction of predatory mammals to oceanic islands has led to the extinction of many endemic birds. Although introduced predators should favour changes that reduce predation risk in survivingExpand
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