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BiologyVery little is known of the biology of the harlequin mantella. It lays around 40 whitish, spherical eggs in damp leaves or moss (2). Active mainly in the early morning, the harlequin mantella avoids bright sunlight and spends the hottest hours of the day vocalising from within deep crevices in rocks. The short single clicks of the harlequin mantella are said to sound like a cricket's stridulation slowed down (3).