Title: Sound emitted by some grassland animals as an indicator of motion in the surroundings,
Abstract: It is argued based on the results of both numerical modelling and the
experiments performed on an artificial substitute of a meadow that the sound
emitted by animals living in a dense surrounding such as a meadow or shrubs can
be used as a tool for detection of motion. Some characteristics of the sound
emitted by these animals, e.g. its frequency, seem to be adjusted to the meadow
density to optimize the effectiveness of this skill. This kind of sensing the
environment could be used as a useful tool improving detection of mates or
predators. A study thereof would be important both from the basic-knowledge and
ecological points of view (unnatural environmental changes like increasing of a
noise or changes in plants species composition can make this sensing
ineffective).