The rock art in New Zealand can be divided into two regions. North Island features more engravings than paintings, while South Island is unique in that it is the only Polynesian island where there are more paintings than engravings. New Zealand rock paintings are done in red and black pigments and can sometimes be found in inaccessible heights. They typically depict human figures (particularly a front-facing human figure with flexed arms), birds, lizards, dogs, fish, and what has been identified as "birdmen". Engravings in open spaces like cliffsides are generally of spirals and curvilinear shapes, while engravings in enclosed caves and shelters depict faces and boats. The same motifs can also be seen in dendroglyphs on living trees.