the-rx:‘Different patterns of courtship shown by males of the fruit-fly’, fig. 45 from
the-rx: ‘Different patterns of courtship shown by males of the fruit-fly’, fig. 45 from Courtship: An Ethological Study by Margaret Bastock (1967). “Each diagram represents a sequence of events in time. 1 = licking; 2 = vibration; 3 = orientation. The sequences A and B with long bouts of vibration (and licking) are typical of normal flies…” -- source link