The attacks took place off South Padre Island, leaving four people injured. One victim was a man who was transported to the hospital for a severe bite.
Dr. Kesley Banks, a research scientist at the Harte Research Institute, says the encounters were most likely a case of mistaken identity, where the shark thinks humans are fish.
Sharks don't have hands, so they explore their environment with their mouth. They often do something called a "bump and bite" to see if something is something they're interested in eating.
Dr. Banks says sharks are always close to shore, and sightings increase when more people get in the water.
A recent study out of Florida suggests that sharks may be able to predict hurricanes. This may explain why the attacks happened when they did.
The Texas Parks and Wildlife Game Warden says the last time an attack occurred in the South Padre area was five years ago.
Authorities believe a single shark about 6 feet long was responsible for Thursday's attacks.
If you're planning on going swimming in the ocean, be aware of your surroundings and be on the lookout for sharks.