(music composition by Carlos Restrepo
text by Alejandro Valencia-Tobon)
Bat sound signals appear to be divided into three phases: search, approach and terminal phase (this latter one also called ‘feeding buzz’).
These phases are indications of the bat’s activity: in the search phase, bats seek food and, while doing this, each individual is analysing what is happening in its habitat. Encountering possible prey, bats go towards it, emitting pulses in shorter time intervals (approach phase). Finally, during the feeding buzz, bats are so close to their possible prey that pulses are emitted in very short time interval in order to obtain faster information about what is happening and thus have a successful hunt. This process is repeated over and over again.
This particular track includes ultrasonic recordings of search and approach phases of (see graph): Species 01 (search and approach phases), Species 02 (search and approach phases), Species 04 (search phase) and Species 12 (search phase)