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

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.

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.

Man dies in shark attack at Sydney beach

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.

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

South Padre Island shark attack: 2 people bitten at Texas beach

South Padre Island shark attack: 2 people bitten at Texas beach

Two people were bitten by a shark and two others "encountered" the animal at South Padre Island while Fourth of July celebrations are happening with one man severely injured, officials say.

Two people were bitten by a shark and two others "encountered" the animal at South Padre Island while Fourth of July celebrations are happening with one man severely injured, officials say.

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

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.

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

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

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.

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

Sonar image appears to show '50-foot megalodon' shark near boat. This is what it really was

Sonar image appears to show '50-foot megalodon' shark near boat. This is what it really was

An incredible sonar image of what researchers thought was a 50-foot megalodon shark led them to believe the prehistoric beast of the seas had returned – until they realized what it really was. 

An incredible sonar image of what researchers thought was a 50-foot megalodon shark led them to believe the prehistoric beast of the seas had returned – until they realized what it really was. 

Great white shark encounters are increasing due to climate change

Great white shark encounters are increasing due to climate change

Scientists say that rising water temperatures due to climate change are allowing juvenile sharks to expand their territory.

Scientists say that rising water temperatures due to climate change are allowing juvenile sharks to expand their territory.

Aerial video captures shark snack attack off New York beach

Aerial video captures shark snack attack off New York beach

Experts with OCEARCH say these bait fish near the coast could be tied to the recent string of shark sightings in New York and New Jersey this summer

Experts with OCEARCH say these bait fish near the coast could be tied to the recent string of shark sightings in New York and New Jersey this summer

Sharks swimming closer to crowded beaches than previously thought, study says

Sharks swimming closer to crowded beaches than previously thought, study says

"We were surprised to find that the sharks we tracked spent so much time near the lights and sounds of the busy city, often close to shore, no matter the time of day," the study author said.

"We were surprised to find that the sharks we tracked spent so much time near the lights and sounds of the busy city, often close to shore, no matter the time of day," the study author said.