The Megasquid is a large, omnivorous terasquid from the Northern Forest of 200 million AD in the documentary The Future is Wild. It is the biggest of the Terasquids, as well as the biggest land animal of the time.
Larger and more massive than any living land animal (5 meters high and 8 tons in weight), a Megasquid can be seen pushing its way through the soaking vegetation, splintering conifer trunks and pulping the branches of lichen trees as it goes. Air passing through its body causes internal membranes (the megasquid's equivalent of vocal cords) to vibrate and amplify any sound it produced. The sound is amplified by means of a balloon-like sac on the terasquid's forehead which expands and vibrates like with the vocal sac of a frog. As it moves through the forest, the megasquid stakes its territory by bellowing out signals through the drumming rain.
Eight legs, each as broad as a tree trunk, support the beast as it lumbers through the forest, moving at speeds similar to a human's walking pace. When the animal is at rest, its legs are compressed and solid. An interlacing network of cartilage within each column locks together, forming a rigid support for the enormous weight of the animal. In motion, the limbs are lengthened, raising the Megasquid from the ground and allowing alternate pairs of legs to swing forward. Walking on eight legs is not easy, but the megasquid achieves it with a slow, fluid gait, in which two pairs on opposing sides of the body alternate turns with each stride.