Predatory behavior, nesting habits, and impacts on honey bees (Apis mellifera) of an invasive hornet (Vespa tropica) on the island of Guam
Fig 6
Workers in A. mellifera colonies piped repeatedly during V. tropica hornet attacks.
(A) Spectrogram of A. mellifera workers piping when V. tropica attackers were hunting at a hive entrance; audio is from a cell phone recording made ~0.5 m from a hive entrance. White brackets indicate pipes that were clear enough to determine pipe duration; the red bracket indicates a series of many overlapping pipes. (B) Duration of 108 isolated pipes recorded at five hive entrances during hornet attacks.