Giant Tree Octopus
Giant Tree Octopuses resembled regular octopuses, only much larger, being some 15-25 feet across. Their tentacles alone were at least 10 feet long. These could be studded with barbs and suckers with sharp edges they used to climb the trees. This one had purple-pinkish skin and had a deep-yellow beak with a bright-orange mouth and tongue.
Hampering descriptions, however, was the fact that giant tree octopuses had an incredible capacity for camouflage, being able to change their colors and contort and squeeze their bodies to blend in with their environment. They could manifest many different colors and patterns, with green to deep black, red stripes, and blue speckles all known. They typically disguised their tentacles as branches. There was only a slight chance of spotting one so disguised, and it was often only the eyes that revealed them.
Expedition 07b - The Lost Ones