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| Sound produced | yes, active sound production |
| Type of sound produced | cracks or snaps (very broadband bursts) |
| Sound production organ | probably teeth |
| Sound mechanism | not known, but probably stridulation of teeth or bones |
| Behavioural context | spontaneous, but sporadic sound production by male, associated with reproduction & terretorial spawning activities (nest defence). |
| Reference | Tiepelt, H., 2005 |
| Remark | outdoor recording (freshwater lake) at night. Hydrophone was placed in close proximity to nest. |