Social time givers appear to be specifically important in dark cavity-dwelling social animals, but here there are no other clear relationships between the degree of sociability and the effectiveness of social entertainment. The olfactory system is important for social
entertainment in insects. Little is known, however about the molecular and neuronal pathways linking olfactory neurons to the central clock. In the honey bee, the expression, phase and development of circadian rhythms are socially regulated, apparently by different signals. Peripheral clocks regulating pheromone synthesis and the olfactory system have been implicated in social influences on circadian rhythms in the fruit fly.