English: Shimmering behaviour in Giant honeybees. An experimental Giant honeybee nest (140 × 70 cm) attached to a balcony of a hotel in Chitwan, Nepal. On the right, parts of the comb had been removed by a honey hunter some weeks before. With the exception of the mouth zone [8] (bottom right), the bee curtain exhibited a quiescent structure of surface bees, with their heads up and the abdomens down. The movie was recorded with a HD camera with a frame rate of 50 Hz in parallel to the stereo cameras (see Figure 2 for experimental design). At the beginning of the sequence the trigger light (fixed by black adhesive tapes to the wall behind) was turned on for one second. The red spot (middle of the right side of the nest) was produced by the beam of a Laser vibrometer measuring the thoracic z-position of the selected surface bee. Right to the nest, a black-and-white striped dummy wasp was mounted on the cable-car device, and its moving speed and direction were computer-controlled. The dummy wasp provoked shimmering waves before it is seen in the image. Note that the waves originated at the right nest side above the mouth zone. The yellow number on the right bottom gives the time in seconds. The first two waves of this sequence refer to the episodes w1, w2 of Figure 6 (2.1 MB, MPG).