First, when exposed to Samburu voices or bee sounds, vigilance and flight behaviors were triggered, but only in response to bee sounds did headshaking behavior increase, compared to controls (Figs. 1 & 2). (journals.plos.org)
Naturally, then, chuckles and knowing headshakes accompany the launch of the new 991 - series 911 Turbo and Turbo S. (autoweek.com)
In each alarm call, vigilance and flight behaviors were triggered, but headshaking increased only in response to the alarm calls for bees, not to the alarm calls for Samburu tribesmen (Figs. 1 & 2). (journals.plos.org)