Killer Whale Winter Movements Tracked

"To better protect our endangered killer whales, the Northwest Fisheries Science
Center has been tagging the orcas to learn more about where they roam in the
winter...

So, the agency has been putting tags on a fin or two and tracking the whales via satellite. They use a pneumatic dart gun from about 4-12 meters that penetrates the fin tissue with a transmitter’s “retention petals,” the center writes."
 
http://blog.seattlepi.com/thebigblog/2013/01/16/ever-wonder-where-the-killer-whales-go-during-the-winter/