[Daily Mail, where America gets its news] - Dramatic video shows parents grab their children and head for the shore
- A dark fin cuts through shin-deep water on the busy Florida coastline
- It appears to be dusk - when sharks, as nocturnal creatures, are most active
Most shark species are nocturnal, and the Florida Museum urges swimmers to 'avoid being in the water during low light hours (dawn or dusk) and at night when many sharks are most active and feeding'.
An average of five people die each year globally due to unprovoked shark bites,' experts at the museum said.
'The yearly average of unprovoked shark bites on humans globally is 70, resulting in about five deaths,' they said.
'These worldwide numbers are small given the millions of humans that enter the water.
'You have a better chance of dying from a bee sting, a dog or snake bite, or lightning than from a shark bite.'