VELEŠIĆI is a planet rich with life that once also had a large human population, but pollution damaged most of the arable land.  The centuries of emigration that followed have resulted in more people of Velešići heritage living off-world than on Velešići itself.  A few ancient families remain, within well-defended enclaves.  For although the ecology of the planet was disrupted, many creatures survived and adapted to the polluted land.  Of particular interest are the vukpas, which are very dangerous carnivorous pack animals.  In addition to their teeth and claws, vukpas bear one more unusual weapon:  a virus.  Anyone within shouting distance of a pack of vukpas is at risk of infection, and the primary symptom of uncontrollable laughter serves to both attract vukpas and incapacitate their prey.  Hunting parties on Velešići must be extremely cautious, because he who laughs does not last.