Mapping is a basic method in all ecological research because maps provide the means of expressing spatially the relationship of organisms to their habitat, or living environment. This is as true for mapping children's worlds as it is for describing the habitat of baboons or spotted owls. Mapping is also a method that children, including non-literate children, greatly enjoy using, as long as it is introduced in an unintimidating way with appropriate materials.1 Twenty years ago I had all the children aged between four and ten in a small New England town build for me, individually, a model of their own known world, which they then transformed into a map.2 When I meet them today, as adults, they spontaneously recall the importance of that event, even remembering elements they forgot to express in their maps!