Metrioptera roeselli

On sunny days the males sing in prolonged continuous bursts. Although the osng is high-pitched, like that of most bush crickets, it can be heard by most people as a distinctive 'buzz'. In most extensive grassland habitats the males are venly spaced out, and sing from perches.  ... Where wind or rain has broken clusters of grass stems to form a rough 'platform', three or more males may compete to occupy the perch, often emitting short bursts of song as they move about, and briefly skirmishing on contact. [1]

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