Clams live in the sand under the ocean. They lie maybe 1 ft. down in the sand under the ocean so you can get a lot of them if you want to go clamming. +++ Many clams and scallops live ON the sand's surface rather than IN it.
Octopuses live on the bottom of the ocean. They eat by pulling small animals into their mouth with their tentacles. They eat clams, fish, and clams. They paralyze it by injecting it with ink and then tear it into pieces.
Giant clams (Tridacna sp.) can be found in tropical oceans from the South Central Pacific through the Coral Sea, Indian Ocean and up into the Red Sea. In most cases they live right on coral reefs in very shallow waters.