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Examples ofalula
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In birds, the slots formed by thealulaand primary flight feathers allow these animals to have high wing loadings and fairly low stalling speeds.
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This example is from Wikipedia and may be reused under a CC BY-SA license.The evolution of the modern avian traits such as the compact body, clawless wing and thealulaare now known to appear over successive stages.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Thealula, by contrast, is formed by the thumb, which does not completely fuse with the other hand-bones.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Primary coverts andalulaare grey with white margins.
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Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.Since these species are not closely related to modern birds, either thealulaevolved twice, or it did so more than 130 million years ago.
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This example is from Wikipedia and may be reused under a CC BY-SA license.The reduced fingers suggest that it might have had analula.
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This example is from Wikipedia and may be reused under a CC BY-SA license.However,alulafeathers are definitely an aid to slow flight.
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Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.Thealulais the freely moving first digit, a bird's thumb, and typically bears three to five small flight feathers, with the exact number depending on the species.
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This example is from Wikipedia and may be reused under a CC BY-SA license.In the flexed wing the outer squama of thealulais turned upside down above the inner squama, the latter not being affected by the movement of the wing.
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This example is from Wikipedia and may be reused under a CC BY-SA license.The presence ofalulaand a complete set of aerodynamic asymmetric feathers arranged forming a modern wing, indicate well develop flight capabilities, as in many other enantiornithine taxa.
FromThis example is from Wikipedia and may be reused under a CC BY-SA license.
Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.In the flexed wing, the outer squama of thealulais turned upside down above the inner squama, the latter not being affected by the movement of the wing.
FromThis example is from Wikipedia and may be reused under a CC BY-SA license.
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This example is from Wikipedia and may be reused under a CC BY-SA license.The mantle proper is a medium to dark gray-blue as are the tertials and upperwing-coverts, turning to a dark gray at the median, greater and primary coverts and thealula.
FromThis example is from Wikipedia and may be reused under a CC BY-SA license.
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This example is from Wikipedia and may be reused under a CC BY-SA license.When flying at slow speeds or landing, the bird moves itsalulaslightly upwards and forward, which creates a small slot on the wing's leading edge.
FromThis example is from Wikipedia and may be reused under a CC BY-SA license.
Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.