Wood knocking

From squatchopedia.com - All things bigfoot and sasquatch

Wood knocking (also known as tree knocking) is defined as the sound created by two pieces of wood being hit together in order to create a loud noise. Such sounds have long been alleged to be caused by the sasquatch as a method of communication with others of its kind. Many researchers claim that, by creating their own wood knocking sounds in the field, they can illicit a response from a bigfoot. Those questioning the existence of the behavior correctly state that no eye witnesses have ever seen a bigfoot beating on a tree or otherwise creating such a sound.