Araucariaceae is a family of evergreen trees that includes the popular Christmas tree, the Norfolk Island pine. The family is also known as the monkey puzzle tree family, due to the unique pattern of its branches, which makes it difficult for monkeys and other animals to climb. There are a variety of synonyms for Araucariaceae, including the Araucaria family and the monkey puzzle tree family. Another common synonym is the pine family, as Araucariaceae trees closely resemble pines in appearance. Despite the family's name, not all members of Araucariaceae are endangered, although some species, such as the Wollemi pine, are critically endangered.