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Certain words in the English language represent animal sounds: the noises and vocalizations of particular animals, especially noises used by animals for communication. The words can be used as verbs or interjections in addition to nouns , and many of them are also specifically onomatopoeic .
They sound different from the echolocation calls and do not have the same frequency patterns. Fuller details on the types of call and other clues to species identification follow below but Pipistrelles (or "Pips") give good examples of what can be discovered with a bat detector and make a good start to learning how to identify bats.
To avoid this type of jamming, bats typically wait enough time for echoes to return from all possible targets before making the next sound. This can be seen clearly when a bat attacks an insect. The bat produces sounds with progressively shorter time intervals, but always allowing enough time for sounds to travel to the target and back. [6]
They have also been reported to make very high pitched, but audible, squeaking sounds while flying. [3] There is a distinct breeding season, but its timing varies across the bats' range, at any time between December and July. Gestation lasts up to three and a half months, and results in the birth of a single offspring. [3]
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Frequency division (FD) bat detectors synthesise a sound which is a fraction of the bat call frequencies, typically 1/10. This is done by converting the call into a square wave, otherwise called a zero crossing signal. This square wave is then divided using an electronic counter by 10 to provide another square wave.
Moths, as do crickets and most insects that display bat avoidance behaviors, have tympanic organs that display phonotactic and directional hearing; they fly away from the source of the sound and will only have the diving behavior considered above when the sound is too loud—or when, in a natural setting, the bat would be presumably too close ...
The boat’s captain said a whole pod of false killer whales passed close to the dive site, likely causing the loud clicking and squeaking noises that the divers heard.