...In recent years, in an attempt to overcome some of theseproblems, scientists have been placing markers on variousspecies of cetaceans and monitoring their movements...
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
...Radio transmitter tags, in a variety of configurations,may be constructed and attached for short-term studies or forlong-term monitoring of migrating animals...
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
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