What's inside a clam? A retractable foot, a siphon for sucking up water, powerful muscles, and, sometimes, a pearl. And you thought oysters were fancy. Following is the transcript of the video.

The name geoduck comes from the Nisqually Indian gweduc, which means "dig deep." The clam uses a tiny foot to burrow into the seafloor as it grows. Its shell can end up several feet down ...

This special filter-feeding system allows giant clams (Tridacna gigas) to grow to incredible proportions. While they are ...