Portuguese man-of-war jellyfish are increasingly seen off the Jersey Shore. Although the animal may appear like jellyfish, it falls in a different class altogether. The size of its poisonous tentacles can grow as big as 10 and 30 feet. Sometimes they can attain the length of astonishing 160 feet.

Its body is translucent and looks like filled with air. The creature's color appears to be blue and purple. The man o' war usually prefers warm waters in tropical oceans. It feeds on small prey using its tendrils and sometimes it can be found in less expected places because of ocean currents and strong winds.

"Typically in the Northeast, we see these animals periodically in the summer, when they are successfully carried north by the Gulf Stream current. Sometimes the currents move these animals into temperate seas when the winds drive them toward coastlines", said Matthew Landau, a professor of Marine Science at Stockton University.

Officials have said that the animal has been seen in the stretch between Long Beach Island and Stone Harbor for around 25 times. This stretch is nearly 70 miles.

Swimmers must be careful about the man o' wars. Harvey Cedars Beach Patrol has also suggested people to watch out for dangerous marine life.

Keith Stokes, Chief Lifeguard in Ship Bottom, said it's a normal thing for them to see the clear jellyfish. He said these are a little bit more venomous, which is why people need to be careful about them.

Dr. Paul Bologna, associate professor of biology at Montclair State University, said their stings are extremely painful and could be chocking for people who are allergic to bee stings.