would otherwise be established, resulting in excess neighbouring migrations into an area, thus artificially increasing the population. Hunting advocates assert that hunting reduces intraspecific competition for food and shelter, reducing mortality among the remaining animals. Some environmentalists assert that (re)introducing predators would achieve the same end with greater efficiency and less negative effect, such as introducing significant amounts of free lead into the environment and food chain. In the United States, wildlife managers are frequently part of hunting regulatory and licensing bodies, where they help to set rules on the number, manner and conditions in which game may be hunted. Management agencies sometimes rely on hunting to control specific animal populations, as has been the case with deer in North America. These hunts may sometimes be carried out by professional shooters, although others may include amateur hunters. Many US city and local governments hire professional and amateur hunters each year to reduce populations of animals such as deer that are becoming hazardous in a restricted area, such as neighbourhood parks and metropolitan open spaces. A large part of managing populations involves managing the number and, sometimes, the size or age of animals harvested so as to ensure the sustainability of the population. Tools that are frequently used to control harvest are bag limits and season closures, although gear restrictions such as archery-only seasons are becoming increasingly popular in an effort to reduce hunter success rates in countries that rely on bag limits per hunter instead of per area. Laws Illegal hunting and harvesting of wild species contrary to local and international conservation and wildlife management laws is called poaching. Game preservation is one of the tactics used to prevent poaching. Violations of hunting laws and regulations involving poaching are normally punishable by law. Punishment can include confiscation of equipment, fines or a prison sentence. Right to hunt The right to hunt—sometimes in combination with the right to fish—is protected implicitly, as a consequence of the right of ownership, or explicitly, as a right on its own, in a number of jurisdictions. For instance, as of 2019, a total of 22 U.S. states explicitly recognize a subjective right to hunt in their constitutions. Bag limits Bag limits are provisions under the law that control how many animals of a given species or group of species can be killed, although there are often species for which bag limits do not apply. There