History
Early Starfish appeared in the Ordovician period over 450 million years ago. They joined seas already teaming with life in a warm, wet world with no ice. Earth had just two supercontinents at the time, and sea levels were much higher due to the lack of ice caps. However, a 20-million-year freeze at the end of the period wiped out about half the creatures of the sea, leaving Sea Stars among the survivors. They continued to adapt, outliving the larger and larger creatures that eventually filled the seas, right up to the present, when over 2,000 species live worldwide.