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Yellow Tube Sponge Abundant on all the reefs in Cozumel are sponges. You'll find them in all colors; bright yellow, red, orange, blue, purple, brown, green, pink, even white. Its hard to imagine this as an animal, but each sponge is made up of multicellular animals that filter oxygen and nutrients from the water in order to sustain life.

Photos by Bonnie Pelnar - © Under Watercolours