The frequency parameters of call type 2 lie between 29 -- 47 kHz , have most energy at 38 kHz .
The frequency parameters of call type 2 lie between 29 -- 47 kHz , have an average duration of 4.1 ms .
The frequency parameters of call type 2 lie between 29 -- 47 kHz , have most energy at 38 kHz and have an average duration of 4.1 ms .