Ozimops norfolkensis OZNO
The calls are very distinctive, short (4-10 ms) and flat. They are mostly alternating in pitch (about 2 kHz). Here is a very typical sequence:
Here is a recording with a mix of (from left to right) attack phase, focusing buzz, feeding buzz, search phase, attack and then back to search phase.
Attack phase and the two buzz phases in detail:
Typical search and attack pulses (from the above recording):
This is the reason why the sound is so distinct and clear. The oscillogram shows a very sharp attack.