Ten minutes of contact with alien cerumen did not significantly affect rejection rates of worker bees (own cerumen: 18%; alien cerumen: 33%; c12 ¼ 3.52, N ¼ 120, P ¼ 0.06). However, 20 min of contact with alien cerumen significantly increased rejection rates
of workers (own cerumen: 27%; alien cerumen: 72%; c12 ¼ 24.31,N ¼ 120, P < 0.001; Fig.1b). Rejection rates of workers that receivedtheir own colony cerumen did not differ significantly between