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Diptera is a large order containing more than 150,000 species including horse-flies, [a] crane flies, hoverflies, mosquitoes and others. Flies have a mobile head, with a pair of large compound eyes, and mouthparts designed for piercing and sucking (mosquitoes, black flies and robber flies), or for lapping and sucking in the other groups. Their ...
Other flower feeding Brachycerous families are Empididae, Stratiomyidae (soldier flies) and the Acroceridae like various members of the Nemestrinidae (tangle-veined flies), Bombyliidae (bee flies) and Tabanidae (horse-fly) are nectar feeders with exceptionally long proboscises, sometimes longer than the entire bodily length of the insect.
The force component normal to the direction of the flow relative to the wing is called lift (L), and the force component in the opposite direction of the flow is drag (D). At the Reynolds numbers considered here, an appropriate force unit is 1/2(ρU 2 S), where ρ is the density of the fluid, S the wing area, and U the wing speed.
However, once the amount of food becomes greater than a certain amount, the competition between males lowers. [139] This is possibly due to an over-abundance of food resources. On a larger scale, food was found to determine the boundaries of a territory since flies were observed to be more aggressive at the food's physical perimeter.
Some gliding animals may use their gliding membranes for drag rather than lift, to safely descend. Gliding flight: falling at an angle less than 45° from the horizontal with lift from adapted aerofoil membranes. This allows slowly falling directed horizontal movement, with streamlining to decrease drag forces for aerofoil efficiency and often ...
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The pale yellow or grayish conical larvae, like those of most blow flies, have two posterior spiracles through which they respire. The larvae are moderately sized, ranging from 10 to 14 millimeters long. The larva feeds on dead or necrotic tissue for 3 to 10 days, depending on temperature and the quality of the food.
Despite the occasional pilot informing passengers (proudly) of an intention to “make up time in the air,” people usually assume planes are going as fast as they safely can, like a speed limit ...