Is that big fish following me?

Here we have a shark that is bigger than a kayak. If it decides to tip the kayak over there is not much the kayaker can do.
The danger from a shark attack is exaggerated. There are about 60 attacks around the world each year but less than 10% are fatal. There are 360 types of sharks but only 4 of those are known to attack people. It is the sharks that are in trouble as many millions have been killed by humans.

There are also many stories that tell of dolphins protecting humans from shark attacks. Typically the dolphins form a ring around humans in the water who are injured or endangered until the shark leaves.