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Preening in birds is a biologic aspect very important, its allow to ensure their welfare through the maintenance from external parts of theirs body. In relation to that was numerically characterized the preening of male Leistes bellicosus (specie most hit by airplanes Jaen aerodrome), between February and July 2022 at Jaén airport. A continuous recording for 2 hours and focal behavior for 5 minutes was performed, also using the fuzzy logic algorithm and exploratory analysis to measure this behavior. The preening is characterized by having a frequency between 1-4times/5minutes, a duration concentrated mainly between 1-50 seconds and an intensity of 4.7 points (Membership function=0.8). These variables have no correlation with temperature, humidity, wind speed and cloudiness. The wings and the back are the structures that are most cleaned (29 and 21 times/80 observations, respectively).

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