A Cricket, a Burrow, and an Open Acoustic Question
Concept: Show the reported *Gryllotalpa australis* singing burrow in cutaway: a bulb, a narrow connector, a flaring horn, and a narrow exit tunnel. The study describes its shape, not step-by-step construction.
Concept: Locate the *G. australis* male near the bulb–horn connector, with the study’s reported singing frequency of about 2.5 kHz. Explain kHz as a measure of sound frequency.
Concept: Show sound-pressure measurement as the study’s acoustic approach, while making clear that the available excerpt gives no measurement results or model predictions to establish how the burrow shape affects resonance.
Concept: Avoid illustrating a male reshaping its burrow during test chirps as an observed behavior: the supplied study material does not report that action.
Concept: End on the *G. australis* male calling from a shaped burrow, an acoustic structure under study; note that mouth geometry varies among species, so this design is not universal.