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WDM
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Coulomb
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Julian date
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Aerosol
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Telematics
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Venera
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Semiconductor laser
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Disaccharide
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Neoteny
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DMS
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Carbon footprint
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Ferromagnetism
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Endemic stick insect (apterograeffa reunionensis)
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Lambda phage
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Dense Plume
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Enolase
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Pycnocline
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Planck time
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Agent orange
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Epithelium
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Phoenix Mars Lander
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Summer comfort
Alula
In birds, the alula is a set of small feathers attached to the thumb at the end of the anterior limb, used to stabilise flight.
In certain insects, the alula is a small fragment of the wing located near the body and on the trailing edge. Using this lobe, some insects are able to place their wings along their bodies. In syrphids, the alula is used to change direction and speed during flight.
The alula is a fragment of the wing, very useful in flight. © Shyamal, Wikipédia, cc by sa 3.0 - adaptation Toony
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