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- W41743977 abstract "It has long been a puzzle why ‘birds constitute the only vertebrate class that is both rich in species number and exclusively oviparous' (Blackburn & Evans, 1986). Viviparity has evolved in all other vertebrate classes and has evolved independently 93 times among the reptiles (Shine, 1985, Chapter 22), the ancestors of birds. The absence of avian viviparity has frequently been explained by citing morphological or physiological factors which presumably are incompatible with live birth. However, as Blackburn & Evans (1986) show, such arguments cannot be defended and thus argue that birds have achieved most of the advantages of viviparity ‘by such specialisations as endothermy, egg incubation, nest construction, uricotelism, shell pigmentation, parental care, altricial hatchlings, albumen provision, and calcareous eggshells'. Other interpretations are discussed by Anderson, Stoyan & Ricklefs (1987) and Dunbrack & Ramsay (1989)." @default.
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- W41743977 date "1991-12-05" @default.
- W41743977 modified "2023-10-15" @default.
- W41743977 title "Why birds lay eggs" @default.
- W41743977 doi "https://doi.org/10.1017/cbo9780511585739.022" @default.
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