Sponges are definitely animals, but they don't look like most of the animals that we are familiar with. They don't have eyes or even a mouth, yet they function quite well. They filter small things (such as bacteria) out of the water. Sponges very effectively pump water in through their pores, and out through the excurrent channel. Some sponges encrust on rock substrates, others are free-standing. They vary widely in form as well as color. Here are several examples of sponges from Bonaire's reefs.
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