3 shark attacks off Sydney in just over 24 hours; man, boy in critical condition

Three shark attacks in 24 hours leave a man and a 12-year-old critically injured and another boy unharmed at Sydney beaches. Here’s what we know.

OCEARCH founder Chris Fischer on tracking the largest great white shark off the East Coast | ChicagoLIVE
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OCEARCH founder Chris Fischer joins ChicagoLIVE to discuss the recent sighting of one of the largest great white sharks ever tagged off the East Coast. Fischer explains how his team safely lifts and studies the sharks aboard their research vessel, how OCEARCH data is helping restore ocean balance, and why the organization’s groundbreaking tracking efforts are giving scientists and the public new insight into these vital predators.

Man dies in shark attack at Sydney beach

A man in his 50s was killed by a large shark while surfing at a beach near Sydney, Australia on Saturday.

VIDEO: Florida shark, stingray get into tussle off the coast of Panama City Beach

WATCH: A shark and stingray engaged in quite the tussle last month off the shore of Panama Beach in Florida. A woman was able to capture the moment on camera.

Largest shark ever tagged by research group spotted off Florida coast

Researchers are tracking what may be the largest male white shark ever tagged by OCEARCH, with recent signals coming from off Florida's east coast near Jacksonville.

Scuba divers have 'once-in-a-lifetime' close encounter with great white shark near Catalina

Scuba divers near Catalina had a rare and thrilling encounter with a 15-foot Great White Shark, capturing the moment on video as the shark calmly circled them before swimming away.

Suburban photographer works to save great white sharks

Living near the Great Lakes, the last thing we think about are sharks. But a suburban photographer has dedicated his life to saving the species.

Arlington Heights native focuses on shark conservation
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Living near the Great Lakes, the last thing we think about are sharks. But a suburban photographer has dedicated his life to saving the species.

Hawaii lifeguard, actor Tamayo Perry killed in shark attack while surfing

Oahu North Shore lifeguard and professional surfer Tamayo Perry was killed in a shark attack Sunday, according to Honolulu Ocean Safety.

Shark attack off Hawaii's Oahu island leaves woman seriously hurt

Also Friday, reported back-to-back shark attacks led authorities to temporarily close beaches to swimmers in Walton County, on the Florida Panhandle.

Shark Week returns: Shedd Aquarium expert discusses apex predator's role in ocean ecosystems
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It is Shark Week! We know they are one of the apex predators of the ocean and they scare the heck out of humans, but they?re also extremely important in helping to maintain healthy ocean ecosystems! Kerri Olzewski from the Shedd Aquarium joined Good Day Chicago on Friday to teach us all about the fascinating creatures.

Shark bites leg off American tourist in Turks and Caicos: report

An American tourist has lost her leg after being bitten by a shark while vacationing in Turks and Caicos, police say.

Boy bitten by shark in South Florida during first trip to beach

The family, visiting from Minnesota, decided to head to the beach while they waited for their Miami Beach hotel room.