Heart cockles have windows in their shells made from natural optical fibers, allowing light through to the algae inside them.

According to leading scientists and experts, Earth is entering its 6th Mass Extinction Event — and it’s our fault. Humans ...

An Aussie museum was adding new shells to its collection when one of its experts noticed something fascinating hidden inside.

Turtles have a lower shell, called a plastron, and an upper shell, or carapace. In hard-shelled turtle species, the shells are made up of bony plates that are covered with scale-like “scutes.” ...

In cartoons, when a turtle is spooked, it retreats into and closes up its shell. While used for comic effect, this imagery is based in fact — although not all turtles are capable of this protective ...