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Echinoderms evolved like no other animals on Earth. Most animals evolved bilateral bodies equipped with a head, central nervous system and brain. But echinoderms opted for a different path. They adopted a five-part symmetry with no head to lead the way. Their bodies seem little more than a skeleton made of tiny little plates and water. They don't use large muscles working on large body parts like other animals. Instead they move on hundreds of tiny, water-filled tube feet operated by a hydraulic system that doesn't produce high-speed movement. Most move so slowly that, by our standards, they appear to be nearly stationary. Scientists and now filmmakers have managed to bring these animals to vibrant life -- all through the use of time-lapse photography. When sped up, these animals spring into action competing for dominance, fighting for food, and hunting down prey just like lions on the Serengeti. |
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