There are a number of different species, that get referred to as "clams" in different parts of the world.
Some or rather plain looking (but tasty) while others are delicate and colorful.
Clams don't have heads and only Scallops have eyes.... but they all have a heart, kidneys, a mouth and an anus.
Their shells are made up of two halves that are connected by a hinge of ligament.
Some burrow into the sand, while others (like mussels and oysters) attach themselves to the surrounding substrate.
They open their shells to feed.... drawing water in thru a siphon filtering out the food, conveying it to their mouth via a layer of mucus and then expelling the water thru a different siphon.
They can snap their shells shut for protection.... and some even use the "opening and closing" of their shell to swim.
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