Results 231 to 240 of about 44,293 (251)
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2020
Abstract This chapter covers two themes: feathers and flight. It takes a close look at the many aspects of feathers—their evolution, structure, growth, maintenance, and their replacement through moult. The broad range of functions of feathers in display (including how different pigmentations arise), for insulation, and in flight are ...
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Abstract This chapter covers two themes: feathers and flight. It takes a close look at the many aspects of feathers—their evolution, structure, growth, maintenance, and their replacement through moult. The broad range of functions of feathers in display (including how different pigmentations arise), for insulation, and in flight are ...
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Science, 2000
PALEONTOLOGYOn page [2202][1], researchers describe the 220-million-year-old Longisquama insignis , a squat, mouse-sized reptile with at least six vanelike appendages up to 12 centimeters long sprouting from its spine. The authors argue that the appendages are feathers much like those of modern birds; outside the paper, they have touted the fossil as ...
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PALEONTOLOGYOn page [2202][1], researchers describe the 220-million-year-old Longisquama insignis , a squat, mouse-sized reptile with at least six vanelike appendages up to 12 centimeters long sprouting from its spine. The authors argue that the appendages are feathers much like those of modern birds; outside the paper, they have touted the fossil as ...
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Feathering and flight evolution in Archaeopteryx
Nature, 1976WITH the description of further specimens1,2 there has been a resurgence of interest in Archaeopteryx. Although there is no final agreement on whether it was mainly arboreal or terrestrial, recent opinion3 seems to favour the latter. There has been discussion on its reptile origins4–6 and on its ability to fly and the general problem of the evolution ...
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Relative mass of flight feathers in waders – an update
Wader Study, 2018Studies of moult of flight feathers have traditionally used the moult score, in which primaries were scored between 0 (old) and 5 (fully grown new primary) and added up. The moult score eventually became increasingly replaced by the percentage of grown feather mass because each flight feather has a different mass which should be corrected for. Although
Włodzimierz Meissner +5 more
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Evolution of the dinosaur flight feather: insights from 3-dimensional fossil feathers
2021Modern flight feathers have been historically viewed as appearing early in avian evolution, and possibly originating in non-avian dinosaurs. The assumption that a modern asymmetrical flight feather had evolved by the Late Jurassic and maintained relative morphologic stasis for over 145 million years was informed by 2-dimensional lithic feather ...
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2005
Abstract Feathers are the hallmark of birds. Birds are unique among the flying groups of animals because the capacity to fly is exclusively based on the highly complex modified scales. Feathers come in various shapes and sizes and serve a multitude of functions.
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Abstract Feathers are the hallmark of birds. Birds are unique among the flying groups of animals because the capacity to fly is exclusively based on the highly complex modified scales. Feathers come in various shapes and sizes and serve a multitude of functions.
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MOLT OF FLIGHT FEATHERS IN FERRUGINOUS AND SWAINSON HAWKS
1992(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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