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Sea lions are protecting the ships The US Navy also has a fleet of Sea Lions that they use to protect ships and ports.
The seals patrol the water looking for enemy divers.
They put tags on the divers or even 'restraint devices' that will stop them getting away!
Sea Lions are chosen and trained because they can hear and see really well under water, and can make lots of deep dives.
They were used to protect HMS Ark Royal, for example, in March 2003.
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