>> skomal: yeah. very close now. >> whitaker: white sharks are so close to shore because that's where their favorite food is-- grey seals, thousands of which now call cape cod home. >> skomal: this is the restaurant right here. these sharks have found the restaurant, and they're waiting for the doors to open. you know? and when those seals begin to leave the beach... you know. >> whitaker: it's dinnertime. >> skomal: it's dinnertime. >> whitaker: skomal and his team from the atlantic white shark conservancy are trying to attach electronic tracking tags to as many sharks as they can-- 230 so far. the way they do it is fascinating. pilot wayne davis locates sharks from his spotter plane, then guides boat captain john king onto them. >> wayne davis: use a little gas, john. he's right on the shoal. it's about as good as it's going to get. >> whitaker: standing on a pulpit on the bow of a small boat, greg skomal wields a long pole that has a dart and a tag at the end. >> skomal: right, right there. done. >