Assuming you're implying drag is "air resistance", the drag coefficient of a typical swallow is 0.1 in level fixed wing flight.

Given the following:
Drag Co - 0.1
Density of air - 1.225kg m^3
Cross section - 63.62mm^2
Velocity - 11m/s

We can use the formula "Fd = cd 1/2 ρ v2 A" to get a result of .4715n as the air resistance of an English Swallow in fixed wing level flight at full speed.
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