Andre Norton 
Voodoo Planet 

A gripping story of otherworldly mystery and magic from an acclaimed Grand Master of Fantasy. When Captain Jellico and the crew of the interstellar tramp freighter Solar Queen are invited to visit the planet Khatka by Chief Ranger Asaki, they anticipate a brief respite from the boredom of their mail route. But there is more danger on the verdant jungle world than they know.   Founded as a refuge by Earth Africans, Khatka is a global safari where hunters pay big money to pursue the biggest game. But lately Asaki’s battle against ruthless poachers has been undermined by a vicious witch doctor, Lumbrilo, who takes a mortal dislike to the captain and his men.   And when their craft crashes while over wild country, Jellico, Asaki and their friends soon find themselves not only hunted by Khatka’s lethal fauna, but by Lumbrilo, who sees his chance to get rid of his enemies once and for all . . .Voodoo Planet is the third book in the Solar Queen Series, but you may enjoy reading the series in any order.