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.

Continuing our study of the echinoderms, let's take a look at their body systems, especially the water vascular system and endoskeleton. What else can we say about their general anatomy and physiology? How do sea stars and sea urchins...

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.

Crown-of-thorns starfish are large, spiny, and eat coral reefs and without enough natural predators to control their population, someone had to create one.

This live-action video program is about the word invertebrate. The program is designed to reinforce and support a student's comprehension and retention of the word invertebrate through use of video footage, photographs, diagrams and...

Upon viewing the Simple Animals video series, students will be able to do the following: Differentiate between and provide examples of vertebrate and invertebrate animals. Describe the basic body parts of a sponge (porifera). Explain the...