A slow athlete.
A few bivalves can live on the surface of marine sediments without digging holes, and some can jump with their meat feet and even swim. The queen scallop patted its two shells together and pushed out a stream of water. It swims like this, with amazing speed. Unlike other bivalves, they are very active and need detailed information about their surroundings. Their "eyes" are visible and distributed along the edge of the shell, like some black spots.
depressed
For some bivalves, it is not enough to dig holes in soft mud to protect them. These animals build their homes by drilling holes in wood, coral and even sand, stones and limestone. They use their feet as suckers, pull rocks hard, break the surface shells, and even soften rocks with chemical secretions. Ship-boring worms make holes in wood-usually on the hull-and eat the sawdust they produce.
Grasp and clamp.
Some bivalves don't dig holes, but cling to hard surfaces, such as rocks and seawalls. Oysters secrete shellfish and fuse them with rocks, while muscles produce tough cables and anchor them in place. These bivalves often get together, which may cause problems. For example, if many bivalves gather in the same pipeline, the pipeline may be blocked.