While some sponges, like the giant barrel sponges of the Caribbean, reach several meters in diameter, most sponges are small organisms that often go unnoticed on the reef or seafloor because they don’t look like other, more familiar, animals or noticeably move. Many sponge species grow upright in branching tree-like (Fig. A few species can even bore into hard surfaces like clam shells, coral skeletons, and rock (Fig. Some sponges grow in thin encrusting layers over surfaces (Fig. All adult sponges are sessile, meaning they live permanently attached to rocks or other submerged objects and do not move about on their own. They are found in shallow ocean environments to depths as great as five kilometers (km). Although the majority of sponges are marine, some species live in freshwater lakes and streams. Sponges are simple invertebrate animals that live in aquatic habitats. The phylum Porifera comprises the sponges.
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