Greater Honeyguide Indicator indicator Boran honey collector Laughing Kookaburra Dacelo novaeguineae Vocal communication                                    (Kenya and Australia, 1984-1987). I) In many parts of Africa, traditional people searching for honey communicate with the Greater Honeyguide (Indicator indicator), a bird that leads them to the nests of wild bees. According to Boran honey collectors from northern Kenya, the bird's flight pattern, perching heights, and calls contain information about the direction and distance to and the precise location of the bees' nests. With a combination of interviews, experiments and statistical analyses we were able to provide scientific proof for this statement. Research camp in northern Kenya II) Duetting and group songs in birds are usually believed to strengthen social bonds and, hence, represent “peaceful” signals. In contrast, our studies on Afri-can Slate- coloured Bobous (Laniarius funebris) and Australian Kookaburras (Dacelo novagui- neae) suggest that in these species the vocalisations signal aggression. They serve to defend a territory, guard the mate and maintain a dominance hierarchy.