The Amazing Shapes of Ammonites

Happy Cephalopod Week! When you think of an ammonite, you probably think of a spiral-shelled sea creature. But in fact, this was just one of the many shapes that ammonites took. Museum Curator Neil Landman explains how this array of shapes once confounded evolutionary biologists, and why this variety is actually a good example of how evolution works.

Cephalopod Week is the annual celebration of all things tentacled. Learn more at