Tailless primates, also known as APES, are a group of primates that lack tails and are found in tropical and subtropical regions of Africa and Asia. They are the most intelligent of all primates and include gorillas, chimpanzees, orangutans, bonobos, and gibbons. APES are highly social animals and have complex communication systems. They are also known for their tool-making abilities and use of tools to obtain food.