Caption: Animal skulls are hung from a gourde tree by a Vodou (voodoo) devotee. In Haiti, lwa (spirits) can reside in trees, rocks, streams, household roofs, and other objects. The devotee may serve the spirit residing in this tree in various ways, including animal sacrifices and offerings of food and drink. Several different species of trees occupy important roles within Vodou. Some have strictures against cutting, while others have strictures against planting.