Bigfoot, also known as Sasquatch, is a hairy humanoid creature rumored to lurk in the forests of North America. Bigfoot is part of an interesting class of monsters called "cryptids." Cryptids are the subject of cryptozoology, a (pseudo?)science devoted to tracking down evidence of creatures that have been presumed extinct or fantastical. Other famous cryptids include the Loch Ness Monster and the cuddly Yeti. For an exhaustive list, go here.
Hmm, if the strongest evidence of Bigfoot's existence is this film footage. . .
. . .I remain unconvinced.
This letter exchange between the Texas Bigfoot Research Center and the Texas Department of Parks and Wildlife is impossible.