Bigfoot, also known as Sasquatch, is an alleged ape-like creature purportedly inhabiting forests, mainly in the Pacific Northwest region of North America. Bigfoot is usually described as a large, hairy, bipedal humanoid. Many believers in its existence contend that the same or similar creatures are found around the world under different regional names, most prominently the Yeti of the Himalayas.

The scientific community considers Bigfoot to be a combination of folklore, misidentification, and hoaxes, rather than a real creature. In general, mainstream scientific consensus does not support the posited existence of megafauna cryptids such as Bigfoot, because of the improbably large numbers necessary to maintain a breeding population and because climate and food supply issues would make such purported creatures' survival in reported habitats unlikely. Despite these facts, Bigfoot is one of the more famous examples of a cryptid within cryptozoology.

Bigfoot is described in reports as a large ape-like creature, ranging between 6–10 feet (1.8–3.0 m) tall, weighing in excess of 500 pounds (230 kg), and covered in dark brown or dark reddish hair. Alleged witnesses have described large eyes, a pronounced brow ridge, and a large, low-set forehead; the top of the head has been described as rounded and crested, similar to the sagittal crest of the male gorilla. Bigfoot is commonly reported to have a strong, unpleasant smell by those who have claimed to have encountered it.

The enormous footprints for which it is named have been as large as 24 inches (61 cm) long and 8 inches (20 cm) wide. While most casts have five toes—like all known apes—some casts of alleged Bigfoot tracks have had numbers ranging from two to six. Some have also contained claw marks, making it likely that a portion came from known animals such as bears, which have five toes and claws.

Proponents have also claimed that Bigfoot is omnivorous and mainly nocturnal.

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