EXP 30: Helena with a giant barrel sponge (Xestospongia muta). This photo shows just how massive these sponges can be! They are often referred to as the "redwoods of the reefs" and are an important component of the benthic community on Western Atlantic reefs. PC: Katie Storr

EXP 30: Helena with a giant barrel sponge (Xestospongia muta). This photo shows just how massive these sponges can be! They are often referred to as the “redwoods of the reefs” and are an important component of the benthic community on Western Atlantic reefs. PC: Katie Storr