Sponge parazoans are unique invertebrate animals characterized by porous bodies. This interesting feature allows a sponge to filter food and nutrients from water as it passes through its pores. Sponges can be found at various depths in both marine and freshwater habitats and come in a variety of colors, sizes, and shapes. Some giant sponges can reach heights of seven feet, while the smallest sponges reach heights of only two-thousandths of an inch.