What is the pacific NW tree octopuses natural predator?

The "Pacific tree octopus" was a 1998 internet hoax that was intended as a parody of actual ecological awareness groups. Occasionally individuals will mistake the site as one promoting the preservation of an actual animal. A small following has provided fake photos, testimonials, and other material.

An octopus, as is immediately obvious to anyone who sees one, is a relatively fragile marine animal that (like most sea creatures) could not survive long on dry land.