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Article
Tim R. Birkhead, Auteur ; Robert Montgomerie, AuteurWe evaluate whether a Neolithic engraved rock image at the Alta archaeological site in Finnmark, Norway – of a bird being held by a person – represents a Great Auk Pinguinus impennis. There are several thousand engraved animal figures at Alta, c[...]
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Robert D. Montgomerie, Auteur ; Tim R. Birkhead, AuteurThe body mass and egg mass of the Great Auk Pinguinus impennis were never measured before the bird was driven to extinction in 1844. Previous studies conducted before 1990 used data from related species to estimate the mass of an adult bird at 4[...]
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Tim R. Birkhead, Auteur ; Jürgen Fiebig, Auteur ; Robert Montgomerie, Auteur ; Karl Schulze-Hagen, AuteurDans Ibis (164(2) 2022)Since the late 1600s it has been assumed that the Great Auk Pinguinus impennis was similar to the Common Guillemot Uria aalge and Brünnich's Guillemot Uria lomvia in having a single, central brood patch. Through the examination of eight mounted [...]
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Tim R. Birkhead, Auteur ; Jamie E. Thompson, Auteur ; John D. Biggins, Auteur ; Robert Montgomerie, AuteurA recent broad comparative study suggested that factors during egg formation – in particular ‘flight efficiency’, which explained only 4% of the interspecific variation – are the main forces of selection on the evolution of egg shape in birds. A[...]
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Tim R. Birkhead, Auteur ; Jamie E. Thompson, Auteur ; John D. Biggins, AuteurThe adaptive significance of avian egg shape is poorly understood, and has been studied only in those species producing pyriform (pear-shaped, or pointed) eggs: waders and guillemots (murres) Uria spp., albeit to a limited extent. In the latter,[...]
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Tim R. Birkhead, Auteur ; Jamie E. Thompson, Auteur ; Duncan Jackson, Auteur ; John D. Biggins, AuteurThe adaptive significance of avian egg shape in birds is poorly understood. The pyriform (pear-like) shape of the Common Guillemot's Uria aalge egg has long been considered to be an adaptation to prevent eggs rolling off the bare cliff ledges on[...]
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Nicola Hemmings, Auteur ; Tim R. Birkhead, AuteurHatching failure is widespread in birds, and is usually the result of embryo death rather than infertility. Embryo death can result from both intrinsic and extrinsic factors, some of which may vary across the developmental period. Determining th[...]
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Magnus Svensson, Auteur ; Pekka T. Rintamaki, Auteur ; Tim R. Birkhead, Auteur ; Simon C. Griffith, Auteur ; Arne Lundberg, AuteurDuring the past 30 years, many species of farmland birds have declined dramatically in numbers in Northern Europe, a trend coinciding with a tremendous intensification of agriculture, although the exact causes of these declines remain unclear. O[...]
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Patricia L. R. Brennan, Auteur ; Tim R. Birkhead, Auteur ; Kristof Zyskowski, Auteur ; Jessica van der Waag, Auteur ; Richard O. Prum, AuteurDespite a long history of anatomical studies in birds, the genitalia of most avian species remain undescribed. Birds are the only vertebrate taxon with internal fertilization where an intromittent phallus has been lost in most species. Studying [...]
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Simone Immler, Auteur ; Simon C. Griffith, Auteur ; Richard Zann, Auteur ; Tim R. Birkhead, AuteurThe Zebra Finch Taeniopygia guttata is a model bird species for the experimental study of behavioural and evolutionary concepts in captivity and especially sexual selection. The validity of sexual selection studies of domesticated birds is of lo[...]
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Jessica Meade, Auteur ; Ben J. Hatchwell, Auteur ; Julia L. Blanchard, Auteur ; Tim R. Birkhead, AuteurThe population of common guillemots Uria aalge on Skomer Island, Wales has been monitored since 1963, and in the last 30 yr has increased at an almost constant rate of 5% yr-1. A previous attempt to model the population based on intrinsic demogr[...]
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Karl Schulze-Hagen, Auteur ; Bard G. Stokke, Auteur ; Tim R. Birkhead, AuteurThe brood parasitic habits of the European Cuckoo Cuculus canorus have excited wonder, disbelief and speculation since the fourth century BC. Accurate knowledge of cuckoo biology, however, accumulated only slowly and mostly since 1700. The aim o[...]
