Yes, there are different species of starfish; in fact, researchers estimate there are anywhere between 1800-2000 different species of sea stars worldwide. These species are variable, based on size, color, habitat and water tolerance (fresh vs. saline). The largest starfish on the planet is the Sunflower Star, which can grow to over two feet in diameter, and weigh up to 11 pounds.
Here is a picture of a tiny, baby starfish:
And compare that to one of the larger starfishes!
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