The modern term also encompasses mountain biking, mixed terrain cycle-touring, and the use of motorcycles and other motorized all-terrain vehicles. It may be informal activities of an individual or small group, or larger events organized by a club. Some equestrian trail rides in the USA are directed by professional guides or outfitters, particularly at guest ranches. In some parts of the world, trail riding (of whatever kind) is limited by law to recognized, and sometimes function-specific, trails that are waymarked. In other places, trails may be less maintained and more natural. Trail riding can include other activities, such as camping, hunting, fishing, orienteering and backpacking.