Cryptozoology refers to the search for animals which are considered to be legendary or otherwise nonexistent by mainstream biology. This includes looking for living examples of animals which are extinct, such as dinosaurs; animals whose existence lacks physical support but which appear in myths, legends, or are reported, such as Bigfoot and Chupacabra; and wild animals dramatically outside of their normal geographic ranges, such as phantom cats or "ABCs" (an initialism commonly used by cryptozoologists that stands for Alien Big Cats).
Bigfoot is described in reports as a large hairy ape-like creature, ranging between 6–10 feet (2–3 m) tall, weighing in excess of 500 pounds (230 kg), and covered in dark brown or dark reddish hair. Alleged witnesses hve 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 claim to have encountered it. The enormous footprints for which it is named have been as large as 24 inches (60 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.
2007: On September 16, 2007, hunter Rick Jacobs captured an image of a possible sasquatch using an automatically triggered camera attached to a tree. A spokesperson for the Pennsylvania Game Commission challenged the Bigfoot explanation, saying that it looked like "a bear with a severe case of mange."
The most common description of chupacabras is a reptile-like being, appearing to have leathery or scaly greenish-gray skin and sharp spines or quills running down its back. This form stands approximately 3 to 4 feet (1 to 1.2 m) high, and stands and hops in a similar fashion to a kangaroo. In at least one sighting, the creature was reported to hop 20 feet (6 m). This variety is said to have a dog or panther-like nose and face, a forked tongue, and large fangs. It is said to hiss and screech when alarmed, as well as leave behind a sulfuric stench. When it screeches, some reports assert that the chupacabras' eyes glow an unusual red which gives the witnesses nausea.
Another description of chupacabras, although not as common, describes a strange breed of wild dog. This form is mostly hairless and has a pronounced spinal ridge, unusually pronounced eye sockets, fangs, and claws. It is claimed that this breed might be an example of a dog-like reptile. Unlike conventional predators, the chupacabras is said to drain all of the animal's blood (and sometimes organs) usually through three holes in the shape of an upside-down triangle or through one or two holes.
In July 2004, a rancher near San Antonio, Texas, killed a hairless dog-like creature, which was attacking his livestock. This animal, initially given the name the Elmendorf Beast, was later determined by DNA assay conducted at University of California, Davis to be a coyote with demodectic or sarcoptic mange. In October 2004, two more carcasses were found in the same area. Biologists in Texas examined samples from the two carcasses and determined they were also coyotes suffering from very severe cases of mange. In Coleman, Texas, a farmer named Reggie Lagow caught an animal in a trap he set up after the deaths of a number of his chickens and turkeys. The animal was described as resembling a mix of hairless dog, rat, and kangaroo. Lagow provided the animal to Texas Parks and Wildlife officials for identification, but Lagow reported in a September 17, 2006 phone interview with John Adolfi, founder of the Lost World Museum, that the "critter was caught on a Tuesday and thrown out in Thursday's trash."