Why Have Birds Not Evolved a Wing Design That Allows

question 31

Essay

Why have birds not evolved a wing design that allows for the best of all properties including fast and slow flight,soaring and flapping,all in one bird?

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Definitions:

Activated Motives

Inner drives or desires that have been triggered by environmental or psychological factors and influence behavior.

Basal Metabolic Rate

The number of calories required to keep your body functioning at rest, representing the minimum amount of energy needed for essential physiological functions.

Set Point

The point at which your “weight thermostat” may be set. When your body falls below this weight, increased hunger and a lowered metabolic rate may combine to restore lost weight.

Ghrelin Levels

The concentration of ghrelin, a hormone that stimulates hunger, produced mainly by the stomach.