You may be able to see a Sharknado from miles away, but not necessarily the creatures lurking right off the beach. To solve that, Australia's using transmitters attached to some 320 sharks, and Twitter, to warn beach-goers when big sharks are near. That's only if those sharks get within a kilometer or so of major beaches, where they can become a threat to swimmers who are mistaken for a meal. The system's designed to alert swimmers before they get in the water, as well as lifeguards and other beach patrols.

The program sends messages from the Surf Life Saving Western Australia's Twitter account, and includes information about the sharks, reports Sky News. That includes the particular species, how large it was at the time it was last tagged, and how far off shore it is from any particular beach. Sometimes these alerts even come with a photo if an aerial sighting has been made.