The chambered, or pearly, nautilus (Nautilus pompilius) is a charismatic cephalopod species known for its exceptional spiraling, chambered shell. It belongs to a family that has barely changed since ...

Argonauts actually make their ‘shells’ all by themselves. It’s these thin, spiralling constructions that were the inspiration for their other name the paper nautilus. Their paper-thin ‘shells’ make ...

We think it’s more likely that ammonites would have had eight arms rather than lots of tentacles like a nautilus, though the shell is more similar to that of a nautilus.' Ammonites were born with tiny ...