Please be patient while sound file is loaded. You may have to increase volume settings.
If you did not hear the sound. Click here to download sound file.
| Sound produced | yes, active sound production |
| Type of sound produced | thumps, knocks, escape sounds |
| Sound production organ | pneumatic duct & swim bladder |
| Sound mechanism | not known but probably vibration of swim bladder & pneumatic duct caused by quick contraction of associated muscles |
| Behavioural context | spontaneous exclusively nocturnal sound production associated with foraging behaviour |
| Reference | Tiepelt, H., 2005 |
| Remark | outdoor recording (freshwater lake). Species-specific sounds, mostly single sounds emitted at great intervals. Recorded in presence of an unknown number of other species, late at night. Very noisy background - lowpass filter with corner-frequency of 5000 Hz. |