Their smooth white shells are prized by collectors who scour beaches for those that have washed ashore, but as these pictures reveal, egg cowrie sea snails true beauty emerges in the ocean. The marine ...

The chambered nautilus is a sea creature that belongs in the same class as the octopus. Unlike the octopus, it has a hard shell that’s divided into chambers. As the nautilus matures and grows, it ...

Sea mollusc shells are patterned not through conscious control, but by chemistry acting at the shell’s growing edge. A thin strip of tissue known as the mantle secretes both the shell material and its ...