PBS
How the Starfish Got Its Arms
The story of how the starfish got its arms reminds us that even animals that might be familiar to us today can have incredibly deep histories - ones that stretch back almost half a billion years.
Visual Learning Systems
Introduction to Echinoderms
This video provides a brief introduction to the characteristics and diversity of echinoderms, such as starfish, sea urchins, and sea cucumbers. This video is part of the 11-part series, Classifying Animals.
Wonderscape
Science Kids: Exploring the World of Invertebrates
This video is a lesson on invertebrates, the largest group in the animal kingdom. It explains the two main groups of animals - vertebrates and invertebrates - and focuses on the characteristics and examples of invertebrates. The video...
Getty Images
Leopard sea cucumber (Bohadschia graeffei), Southern Visayas, Philippines
Leopard sea cucumber (Bohadschia graeffei), Southern Visayas, Philippines
Getty Images
Crown of Thorns Starfish (Acanthaster planci) tube-feet on underside of thorns, Great Barrier Reef
Crown of Thorns Starfish (Acanthaster planci) tube-feet on underside of thorns, Great Barrier Reef