Except for apes and humans, primates have tails. These are the only wild apes or monkeys found in Europe. Pelvic thrusting is observed in infant monkeys, apes, and humans. The latter was closely related to tarsiers, monkeys, and apes. Bonobos form a matriarchal society, unusual among apes. The canopy is home to many of the forest's animals, including apes and monkeys. This view is supported by studies of higher apes, particularly chimpanzees. They bow, and hostilities between humans and apes suddenly cease. Orangutans live a more solitary lifestyle than the other great apes. Humans have a density of hair follicles comparable to other apes. Secondary consciousness is seen in animals with semantic capabilities, such as the four great apes. All great apes have similar genetic structure. Pepperberg wrote that Alex's intelligence was on a level similar to dolphins and great apes. He interpreted this behavior as something resembling insight in apes. The Colonel in the science fiction film "War for the Planet of the Apes".