A surfing robot is being used to track great white sharks off the coast of California, US, by marine scientists.
The mobile transmitter is the latest addition to an extensive programme of electronic tagging.
Researchers aim to fine-tune 12 years of results with the self-propelled craft and raise public awareness of the area's diverse wildlife.
Shark fans are able to follow the animals' movements via a free app for smartphones and tablet computers.
The project is led by shark expert Professor Barbara Block from Stanford University, who describes the area off the coast of San Francisco as the "blue Serengeti", comparing its underwater highways to the migratory routes in Africa.
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