These enigmatic cephalopods are famous for attacking sailing ships and challenging whales for dominance of the world's oceans in an ongoing struggle in the cold, black watery depths. Also they have among of the most advanced eyes in the animal kingdom. I invented this model almost by accident in a failed attempt to create a spider.

These enigmatic cephalopods are famous for their ability to rapidly change the color and pattern of their skin. They use their tentacles to capture prey and the frilly fins on the sides of their bodies to swim forward and backwards, and to hover. They also have very advanced eyes. Despite their name, cuttlefish are not fish, but mollusks.

This kind of shelter is open on one side and usually built of logs. It is ubiquitous in state parks in the northeastern United States. It I have fond memories of camping at them in the Adirondacks.

A variation on the Pent-Hex tessellation, using only pentagons. The one shown is a second-order fractal, but it could recurse to any depth if the folder has enough patience. Also, this models is flat, but the same pattern could be used to tile a curved surface. A spherical surface would result in a closed polygon with 72 pentagonal bases. The base would be a dodecahedron. This is on my list of things to fold.