Scotsman: AS THE naked, painted young men of the Kamayura tribe prepare for the ritualised war games of a festival, they end their haunting fireside chant with a blowing sound – “whoosh, whoosh” – a symbolic attempt to eliminate the scent of fish so they will not be detected by enemies. For centuries, fish from jungle lakes and rivers have been a staple of the Kamayura diet, the tribe’s primary source of protein. But fish smells are not a problem for the warriors any more. Deforestation and, some …