Over the past 14 years more than 50 have been seen in island waters
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Channel island residents are being asked to report their sightings of basking sharks as part of a conservation project.
Over the past few years basking sharks have been seen in Channel island waters, and the Marine Conservation Society is hoping to monitor them.
The creatures live on plankton and can grow to be longer than a double decker bus.
Over the past 14 years more than 50 have been seen in waters off the Channel Islands.
Warm seas
Conservationists think they may be attracted to warm local seas where plankton is in plentiful supply.
But there are fears they are at risk of being hit by boats or becoming tangled up in fishing gear.
The Marine Conservation Society hopes islanders will report their sightings.
It is hoped the resulting records will help ensure the survival of what the group describes as "this spectacular giant".