What happens when the brain never fully forms? Anencephaly is a rare and severe neural tube defect where major portions of the brain, skull, and scalp fail to develop during early pregnancy. In this video, we break down how this condition occurs, and what it looks like in bone. We explore how anencephaly leaves a distinct and sobering mark on the skeleton—and what those remains can teach us about early development gone awry. | The Bone Museum

Covering the Red-Eyed Tree Frog’s iconic eyes are special eyelids, called nictitating membranes. When the frog’s eyes are closed, the eyelids help it blend in with its leafy environment. (via Untamed) | National Geographic TV