Great apes are impressive architects, but their tree top nest-building remains one of their most understudied abilities. Before turning in for the evening, orangutans will weave complex platforms as high as 65 feet in the tree canopy. Between the ages of one and four, the young apes start practicing how to build day nests while learning from their mistakes. “The choice of tree species is important, and infants—who primarily peer at their mothers—are more likely to select the same species their mothers use.”Orangutan nests can include blankets, linings, and even pillows. These role models further reinforced knowledge on which trees to use, what materials to build with, and even which accessories to use when furnishing their nests.