Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(A) Waveform and (B) audiospectrogram. The first note is an example of a "Type I" note, while the second and third are "Type II" notes. Recorded on 02 February 2012 at 21 h 30 min. Air temperature during recording = 18.2°C.
