Prehistoric Bird Used Club-Like Wings as Weapon
نویسندگان
چکیده
منابع مشابه
Prehistoric bird extinctions and human hunting.
Holocene fossils document the extinction of hundreds of bird species on Pacific islands during prehistoric human occupation. Human hunting is implicated in these extinctions, but the impact of hunting is difficult to disentangle from the effects of other changes induced by humans, including habitat destruction and the introduction of other mammalian predators. Here, we use data from bones colle...
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Birds were omnipresent occupants of the prehistoric sky world. Early chroniclers of Historic period Indian communities recorded that native populations believed birds were air-born emissaries of powerful spirits in the sky world. Various pleadings could be ritually transmitted to upper world forces through these winged messengers. It was felt upper world spiritual forces controlled the environm...
متن کاملMagnitude and variation of prehistoric bird extinctions in the Pacific.
The largest extinction event in the Holocene occurred on Pacific islands, where Late Quaternary fossils reveal the loss of thousands of bird populations following human colonization of the region. However, gaps in the fossil record mean that considerable uncertainty surrounds the magnitude and pattern of these extinctions. We use a Bayesian mark-recapture approach to model gaps in the fossil re...
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Our knowledge of Cretaceous plumage is limited by the fossil record itself: compression fossils surrounding skeletons lack the finest morphological details and seldom preserve visible traces of colour, while discoveries in amber have been disassociated from their source animals. Here we report the osteology, plumage and pterylosis of two exceptionally preserved theropod wings from Burmese amber...
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BACKGROUND Powered flight is implicated as a major driver for the success of birds. Here we examine the effectiveness of three hypothesized pathways for the evolution of the flight stroke, the forelimb motion that powers aerial locomotion, in a terrestrial setting across a range of stem and basal avians: flap running, Wing Assisted Incline Running (WAIR), and wing-assisted leaping. METHODS Us...
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ژورنال
عنوان ژورنال: Asian Journal of Scientific Research
سال: 2011
ISSN: 1992-1454
DOI: 10.3923/ajsr.2011.203.203