منابع مشابه
Courting bird sings with stridulating wing feathers.
In birds and other vertebrates, most acoustic signals are produced pneumatically by moving air through a vocal apparatus. Here we describe a unique mechanism used to produce a tonal acoustic signal in vertebrates. Video recordings of the courtship displays of male Club-winged Manakins, Machaeropterus deliciosus, reveal that males produce sustained harmonic tones through interactions among oscil...
متن کاملOn the efficiency of bird-inspired dual-wing generator
Bird flight, with its simplicity, elegance and efficiency, has garnered much interest in scientific and engineering projects. In 2014, Festo, a German robotics company inspired by how efficient a bird wing can produce lift, built a dual-wing generator (DWG) that mimics the movement of wings in flight to extract wind energy and produce electricity. It claims its prototype achieves higher efficie...
متن کاملAutomatic identification of bird targets with radar via patterns produced by wing flapping.
Bird identification with radar is important for bird migration research, environmental impact assessments (e.g. wind farms), aircraft security and radar meteorology. In a study on bird migration, radar signals from birds, insects and ground clutter were recorded. Signals from birds show a typical pattern due to wing flapping. The data were labelled by experts into the four classes BIRD, INSECT,...
متن کاملWing amputation in a Golden eagle with humeral fracture
Case Description-An adult golden eagle with a wound on its right wing caused by gunshot was presented to the University of Tabriz, Veterinary Teaching Hospital. Clinical Finding-Clinical examination and radiographs, revealed compound fracture in distal third of humerus, severe soft tissue compromise and irreparable loss of blood supply. Anemia and leukocy...
متن کاملThe Evolution of HoxD-11 Expression in the Bird Wing: Insights from Alligator mississippiensis
BACKGROUND Comparative morphology identifies the digits of the wing of birds as 1,2 and 3, but they develop at embryological positions that become digits 2, 3 and 4 in other amniotes. A hypothesis to explain this is that a homeotic frame shift of digital identity occurred in the evolution of the bird wing, such that digits 1,2 and 3 are developing from embryological positions 2, 3 and 4. Digit ...
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ژورنال
عنوان ژورنال: The Iowa Review
سال: 2014
ISSN: 0021-065X,2330-0361
DOI: 10.17077/0021-065x.7531