The most popular and has the least impact on flying bat species method of determining the orientation of their environment emitted ultrasonic frequency by using a dedicated ultrasonic detector. The following table provides information about Lithuania found in bat ultrasonic signal frequency ranges and peak. Signal peak frequency in many cases, and help to identify the type of. Using ultrasonic detector with automatic frequency identification, it is close to the display on the screen. However, the detector set frequencies may be slightly different from the fall table, because eating or returning to shelters bats may use slightly different signals. Their frequency depends on the environment, a bat flies: slightly different signals if the same bat flying near trees, over water, mouse, adjacent buildings and the like.. Also, the signal frequency setting may be affected and near praskrendančio other type of bat emitted ultrasound.
In determining the type of ultrasonic detector is also very important to pay attention to the nature of hearing the signal - its rhythm, duration, sounds. Signal and spaces between the duration of a second counted, so the table it will be of little use - signals need to hear. The sound knowledge of nature really comes in handy sometimes. However, in some cases even in the presence of signal peak, The rhythms and heard the sound character, decide which type is difficult. Therefore, you should pay attention to, where and how the bat fly, what it looks like (size, their shape and so on.). And only on the basis of all the information (research local, set the signal peak, I hear the alarm sound nature and looking at the bat flight) created impression can be made of the type observed in bats. And if you can not, there is no need to worry - even for experienced researchers of a bat can not be recognized (even using recorded ultrasound analysis spektogramų).
