Critter Corner: National Geographic's SharkFest features FIU professor

• That's partly because of a proliferation of cameras and drones but also because conservation strategies are helping numbers rebound, he says.

Why it matters: Sharks are "functionally extinct" on scores of reefs worldwide. But regulations in the U.S. and the Bahamas have had some success protecting them, according to the Global FinPrint Project, an organization Heithaus is involved with that's trying to rebuild populations.

Zoom in: South Florida is home to numerous shark species, including blacktips, sandbars and great hammerheads.

• "Most of these species are not dangerous to people and want nothing to do with us," Heitaus says.

Of note: SharkFest — a slate of shark-focused programming on National Geographic — is airing throughout July.

• Heithaus is featured in five of this year's shows: "Bull Shark vs. Hammerhead," "Sharks vs. Dolphins: Bahamas Battleground," "Sharkcano: Hawaii," "When Sharks Attack 360, Episode 2" and "Saved From a Shark."