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Alula (Noun)

Scalelike structure between the base of the wing and the halter of a two-winged fly.

Nouns denoting animals.

The alula plays a crucial role in maintaining the stability and control of the fly's flight.
Flies that lack an alula often have difficulty navigating through dense vegetation or landing on smooth surfaces.
In some species of flies, the alula is highly modified and serves as a vital component of their elaborate courtship displays.
The shape and size of the alula can vary significantly between different families of two-winged flies.
Entomologists often examine the structure and shape of an insect's alula to identify the species and determine its evolutionary relationships.

Tuft of small stiff feathers on the first digit of a bird's wing.

Nouns denoting animals.

The alula of the sparrow helps to control airflow over the wing during flight.
Birds with a well-developed alula tend to be more agile and maneuverable in the air.
The alula is a distinctive feature of the wing of many songbirds, including the finches and sparrows.
When a bird flaps its wings, the alula acts as a rudder, providing extra lift and stability.
In some species, the alula is highly specialized, with longer or more rigid feathers than the rest of the wing.