The experimental setup for recording moth's ultrasonic clicks under natural conditions.
The acoustic locator is fixed on a birch trunk 2 meters above the ground. The microphone is situated in front of the parabolic mirror which is attached to the electronic block part. One meter below the locator the birch cortex is greased with an attractant for noctuid moths (mixture of beer and honey which started to ferment). Moth flying up to the birch get into the area of locator sensitivity. The recorded moth's clicks are broadcasted to the FM receiver situated in the laboratory.