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Of the birds classified as perching birds or 'songbirds,' the Common Raven is the largest, the size of a hawk. Often its deep croaking call will alert the observer to a pair of ravens soaring high ...

developed Raven to maximise gait diversity while minimising weight. The drone weighs just 0.62 kg and features custom avian-inspired legs that mimic the proportions and mechanics of bird limbs.

While all five species have a tuneless, guttural tone that will never win a bird singing contest, each has a distinctive variation. "The typical Australian raven call is the most distinctive ...