quality:correction
Food source and ecology

Clams are shellfish that make up an important part of the web of life that keeps the seas functioning, both as filter feeders and as a food source for many different animals. Extant mammals that eat clams include both the Pacific and Atlantic species of walrus, all known subspecies of harbour seals in both the Atlantic and Pacific, most species of sea lions, including the California sea lion, bearded seals and even species of river otters that will consume the freshwater species found in Asia and North America. Birds of all kinds will also eat clams if they can catch them in the littoral zone: roseate spoonbills of North and South America, the Eurasian oystercatcher, whooping crane and common crane, the American flamingo of Florida and the Caribbean Sea, and the common sandpiper are just a handful of the numerous birds that feast on clams all over the world. Most species of octopus have clams as a staple of their diet, up to and including the giants like the Giant Pacific octopus.