“…This recruitment signal is paired with a stop signal that inhibits dancing (Kirchner, 1993;Nieh, 1993;Pastor & Seeley, 2005;Seeley et al, 2012) when foragers experience conspecific attack (Nieh, 2010) or food source overcrowding (Lau & Nieh, 2009;Nieh, 1993;Thom, 2003). The stop signal is a 300e400 Hz vibrational signal with a duration of approximately 150 ms (Lau & Nieh, 2009;Seeley et al, 2012) that a worker usually delivers while butting its head into the body of the receiver, causing the receiver to momentarily freeze (Kietzman, 2015;Michelsen, Kirchner, & Lindauer, 1986;Nieh, 1993;Thom, Gilley, & Tautz, 2003). Although they can be triggered by peril, stop signals are not necessarily warning signals because they inhibit recruitment dancing in another context, house hunting (Seeley et al, 2012).…”