Two videos allegedly showing a great white shark swimming off the Cornish coast has sparked a frenzy among holiday makers desperate to catch a glimpse of one of nature's deadliest animals.

However, unlike in the movie Jaws, sharks are not bent on revenge. If they attack humans it's because they think we're fish. Whenever they sense blood in the water, they get excited and it can trigger one of their famous feeding frenzies in which they will bite everything that moves.

Sharks strike no matter the time of day or the condition of the water. Hunger, territorial defence, movement, and mistaken identity are the main reasons for these attacks, which occur mostly along the coasts of North America, South Africa, and the Caribbean.

Take a look at some of the other deadly animals that roam our planet.