It is a fictional octopus capable of living on land. They can supposedly be found in temperate rainforests of the Olympic Peninsula on the west coast of North America. They leave in trees, but prefer damp places like small puddles.
The tree octopus, or Pacific Northwest tree octopus (Octopus paxarbolis), is a fictional creature and does not exist in reality. In the context of the myth, it is often described as being about the size of a cat, measuring around 2 to 3 feet in length. This creature is often used in educational settings to illustrate the importance of critical thinking and evaluating sources.
The whole species of octopus is not entirely endangered, but there are some subspecies that are endangered, threatened, or close to being endangered: The Giant Octopus, a giant but gentle octopus, is listed as "Endangered" on the ICUN Redlist.