The Igorot (Tagalog for 'mountaineer'), or ethnolinguistic groups in the Cordilleras, are any of various ethnic groups in the mountains of northern Luzon, Philippines, all of whom keep or have kept until recently, their traditional religion and way of life. Some live in the tropical forests of the foothills, but most live in rugged grassland and pine forest zones higher up. The Igorot numbered about 1.5 million in the early 21st century. Their languages belong to the northern Luzon subgroup of the Philippine languages, which belong to the Austronesian (Malayo-Polynesian) family. There are nine main ethnolinguistic groups in the Cordilleras.