Learn A sea ball, washed ashore on a sandy beach on Plum Island in Newbury, Massachusetts. These roughly spherical balls, which are also referred to as "whale burps," "surf balls," or "beach balls," usually consist of fibrous plant material, such as seagrasses, saltmarsh grasses, and beach grasses, often intermixed with pieces of seaweed. They may also contain fishing line or other trash. It is believed that these materials are compacted into balls from the churning action of waves in shallow water, especially under stormy conditions. This page is under construction. Please check back soon!