At nearly 14 inches long, a mammoth mollusk is still alive and growing, says the biologist who found it in Denmark. The oyster is roughly comparable to a size 11 shoe.

This mere entanglement (more or less accidental) of copper-bearing material in the passages of the oyster may also be the explanation of the extraordinarily high figure reported by Mr. Lowe—a ...

In the past two decades, the oyster population in Mississippi’s Gulf waters has been devastated by both natural and manmade disasters. Among those working to restore oyster habitats is ninth ...