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Grizzly Bear Surveillance

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To conduct grizzly bear surveillance in Yellowstone National Park, each bear was fitted with a collar containing radio transmitters. After the bears were released back into the forest, park rangers were able to tune into the signals coming from the collars using a radio receiver. This started a "tracking revolution" for tracking wildlife. A major disadvantage for these tracking collars though, is that they weren't much use to marine biologists as radio waves don't travel well through salt water. Biologists and engineers eventually were able to follow fish using acoustic tags. These tags created sound waves that could be detected by underwater microphones attached to boats. The tags measured how the fish moved through it's environment.

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