If you are tempted to escape to Florida for a holiday now might not be a good time.

But if you do hit the sunny beaches, you may want to avoid going for a swim.

That's because tens of thousands of sharks are migrating in huge swarms, and it's happening just off the coast.

Florida Atlantic University biological sciences professor Stephen Kajiura took video from the air of blacktip sharks invading the waters of Palm Beach, on Florida's Atlantic coast.

He has been monitoring their movement since January 15. But he decided to get footage from 5,000ft in the air.

Kajiura told WPEC: "There are literally tens of thousands of sharks a stone's throw away from our shoreline.

"You could throw a pebble and literally strike a shark. They are that close."

Blacktips are the most common species in that part of Florida and are behind the majority of shark bites.

However, according to the National Oceanic and Atmospheric Administration, there hasn't been a fatal attack yet.

They are named by the black markings on the tips of their fins and are common in the warm Atlantic waters between South Carolina and Texas.

Every winterm, during their mating season, they move to find warmer parts of the ocean.

They feed on fish, stingrays and squids.

Blacktips have also been known to follow fishing boats and feed on culled catches.